Ethylene-substituted phenylalkylethylenediamine-platinum (II or IV) derivatives and phenylalkylethylenediamines

ABSTRACT

Antitumor acting platinum(II or IV) complexes of the general formula ##STR1## where B represents a phenyl-C 1  -C 4  -alkyl radical which is optionally substituted in the phenyl nucleus by the radical R 1  and R 1  is hydrogen, halogen, trihalogen methyl, C 1  -C 6  -alkyl, hydroxy, C 1  -C 6  -alkoxy or C 2  -C 6  -alkanoyloxy or where B together with the structural part H 2  N-CR 2  &lt; forms a tetrahydroisoquinoline radical, if B contains benzyl and R 2  hydrogen and the benzyl radical in the 2-position contains the CH 2  -radical or where B together with the structural part --CR 2  &lt; represents a tetrahydronaphthyl radical in which one CH 2  group is optionally replaced by oxygen, or where B together with the structural part --CR 2  &lt; represents a decahydronaphthyl radical or an indanyl radical; R 2  represents hydrogen, C 1  -C 6  -alkyl, phenyl or phenyl-C 1  -C 4  -alkyl, it also being possible for the phenyl ring of this group R 2  to be substituted by hydroxy, C 1  -C 4  -alkoxy, C 1  -C 4  -alkyl, C 2  -C 6  -alkanoyloxy or halogen; the radicals R 3  and R 4  are the same or different and represent hydrogen, C 1  -C 12  -alkyl, C 3  -C 8  -cycloalkyl and X stands for the equivalent of a physiologically acceptable anion or X can also be a water molecule, where in the latter case the missing negative charge is saturated by a corresponding physiologically acceptable acid anion, where in the case of platinum(II) complexes, two of the groups X are absent.

This is a division of Ser. No. 683,431, filed Apr. 10, 1991.

The present invention relates to new ethylene-substituted phenylalkylethylenediamine-platinum(II or IV) derivatives and phenylalkylethylenediamines. These compounds are useful as tumor inhibiting agents.

BACKGROUND OF THE INVENTION

German published patent 36 05 191 describes anti-tumor acting (1-benzylethylenediamine)-platinum(II) complexes of the general formula: ##STR2## in which the radicals R₁, R₂, R₃ and R₄ are the same or different and represent hydrogen, a C₁ -C₆ -alkyl group, a benzyl group or a phenylethyl group, and B is a thienyl radical, an indolyl radical, an imidazolyl radical or a phenyl radical substituted by the radicals R₅, R₆ and R₇ and the radicals R₅, R₆ and R₇ are the same or different and represent hydrogen, halogen, trihalogen methyl, C₁ -C₆ -alkyl, hydroxy, C₁ -C₆ -alkoxy, phenoxy, benzyloxy, C₁ -C₆ -alkanesulfonyloxy, carboxy, C₁ -C₆ -carbalkoxy, cyano, aminocarbonyl, aminocarbonyl containing one or two C₁ -C₆ -alkyl radicals, C₁ -C₆ -alkylcarbonyl, nitro, amino, C₁ -C₆ -alkamino, di-C₁ -C₆ -alkylamino, (C₁ -C₆ -alkyl)₃ N⁺, C₁ -C₆ -alkanoyl-amino, C₁ -C₆ -alkyl-C₁ -C₆ -alkanoyl-amino, C₁ -C₆ -alkanesulfonylamino, C₁ -C₆ -alkyl-C₁ - C₆ -alkanoylamino, aminosulfonyl, aminosulfonyl containing one or two C₁ -C₆ -alkyl radicals, C₁ -C₆ -alkoxysulfonyl (--SO₂ --O--C₁ -C₆ -alkyl), sulfo(--SO₃ H) or C₁ -C₆ -alkanesulfonyl and two of these radicals can also be the methylenedioxy group and X stands for the equivalent of a physiologically acceptable anion.

SUMMARY OF THE INVENTION

The present invention relates to platinum(II or IV) complexes of the general formula: ##STR3## where B represents a phenyl-C₁ -C₄ -alkyl radical which is optionally substituted in the phenyl nucleus by the radical R₁ and R₁ is hydrogen, halogen, trihalomethyl, C₁ -C₆ -alkyl, hydroxy, C₁ -C₆ -alkoxy or C₂ -C₆ -alkanoyloxy or where B together with the structural part H₂ N-CR₂ < forms a tetrahydroisoquinoline radical, if B contains benzyl and R₂ is hydrogen and the benzyl radical in the 2-position contains the CH₂ -radical or where B together with the structural part --CR₂ < represents a tetrahydronaphthyl radical in which one CH₂ group is optionally replaced by oxygen, or where B together with the structural part --CR₂ < represents a decahydronaphthyl radical or an indanyl radical; R₂ represents hydrogen, C₁ -C₆ -alkyl, phenyl or phenyl-C₁ -C₄ -alkyl, it also being possible for the phenyl ring of this group R₂ to be substituted by hydroxy, C₁ -C₄ -alkoxy, C₁ -C₄ -alkyl, C₂ - C₆ -alkanoyloxy or halogen;

the radicals R₃ and R₄ are the same or different and represent hydrogen, C₁ -C₁₂ -alkyl, C₃ -C₈ -cycloalkyl, phenyl which is optionally substituted by C₁ -C₆ -alkoxy and, if B is a benzyl radical (optionally substituted as stated), at least one of the radicals R₂, R₃ and R₄ is not hydrogen and X stands for the equivalent of a physiologically acceptable anion or X can also be a water molecule, where in the latter case the missing negative charge is saturated by a corresponding physiologically acceptable acid anion, where in the case of platinum(II) complexes, two of the groups X are absent.

The present invention also relates to phenylalkylethylenediamine of the General Formula: ##STR4## substituted in the ethylene part where B represents a phenyl-C₁ -C₄ -alkyl radical which is optionally substituted in the phenyl nucleus by the radical R₁ and R₁ is hydrogen, halogen, trihalogen methyl, C₁ -C₆ -alkyl, hydroxy, C₁ -C₆ -alkoxy or C₂ -C₆ -alkanoyloxy or where B together with the structural part H₂ N-CR₂ < forms a tetrahydroisoquinoline radical, if B contains benzyl and R₂ hydrogen and the benzyl radical in the 2-position contains the CH₂ -radical or where B together with the structural part --CR₂ < represents a tetrahydronaphthyl radical in which one CH₂ group is optionally replaced by oxygen, or where B together with the structural part --CR₂ < represents a decahydronaphthyl radical or an indanyl radical; R₂ represents hydrogen, C₁ -C₄ -alkyl, phenyl or phenyl-C₁ -C₄ -alkyl, it also being possible for the phenyl ring of this group R₂ to be substituted by hydroxy, C₁ -C₄ -alkoxy, C₁ - C₄ -alkyl, C₂ -C₆ -alkanoyloxy or halogen, the radicals R₃ and R₄ are the same or different and represent hydrogen, C₁ -C₁₂ -alkyl, C₃ -C₈ -cycloalkyl, phenyl which is optionally substituted by C₁ -C₆ -alkoxy and, if B is a benzyl radical (optionally substituted as stated), at least one of the radicals R₂, R₃ and R₄ is not hydrogen and salts thereof.

The following information relates to preferred embodiments of the invention:

The C₁ -C₆ -alkyl groups, C₁ -C₆ -alkoxy groups and the C₁ -C₆ -alkanoyloxy groups may be straight or branched. The alkyl or alkoxy groups preferably consist of 1 to 4 carbon atoms, the alkanoyloxy groups preferably of 2 to 4 carbon atoms. The alkanoyloxy group may in particular be the acetoxy group. The halogen substituents may in particular be bromine, chlorine and/or fluorine. In the case of the phenyl-C₁ -C₄ -alkyl group, the alkyl part preferably consists of one, two or three carbon atoms, preferably the benzyl group (phenylmethyl group) or the 1-phenylethyl group, the phenyl part optionally being substituted in each case as stated, the substituents preferably being in the 4-position.

A particularly beneficial effect is displayed by those compounds of Formula I in which the radicals R₃ and R₄ are hydrogen or C₁ -C₄ -alkyl, in particular methyl and/or R₂ a C₁ -C₄ -alkyl group (in particular methyl or ethyl) a phenyl group or a phenyl group substituted by hydroxy (preferably p-hydroxy) and B represents a benzyl radical or a phenylethyl-(1)-radical where the phenyl ring of B is optionally substituted in particular by halogen (Cl) or hydroxy. This substituent (halogen or OH) is then preferably in the 4-position.

If B represents a phenyl-C₁ -C₄ -alkyl radical, this is preferably straight-chain, the phenyl group is preferably in ω-position. The same also applies if R₂ represents phenyl-C₁ -C₄ -alkyl. The C₃ -C₈ -cycloalkyl group (R₃, R₄) is preferably the cyclobutyl-, cyclopentyl-, cyclohexyl- or cycloheptyl group. Should there be platinum(IV)-complexes, 2 of the groups X preferably represent in each case OH or halogen (Cl, Br), whereas all the meanings given herefor are possible for the two other X. Should B together with the structural part --CR₂ < form a bicyclic ring, the following radicals are preferably involved: indanyl, preferably indanyl-(2) (see formula below); tetrahydronaphthyl, preferably tetrahydronaphthyl-(1) or tetrahydronaphthyl-(2) (see formula below); 1-oxa-tetrahydronaphthyl, preferably 1-oxa-tetrahydronaphthyl-(4), decahydronaphthyl, preferably decahydronaphthyl-(1). ##STR5## (In the case of the oxa-tetrahydronaphthyl radical a CH₂ group of the bicyclic ring is replaced by an oxygen atom in the right hand formula: in the case of the decahydronaphthyl radical, the phenyl part of the bicyclic radical is also completely hydrated).

Should B together with the structural part H₂ N--CR₂ < form a bicyclic ring (tetrahydroisoquinoline radical), these are compounds having the following structure: ##STR6##

The radicals X, which may be the same or different, represent the known and conventional physiologically acceptable and pharmaceutically applicable anions of single or multivalent acids or also the hydroxy anion (OH⁻). Should these acids have asymmetrical carbon atoms, these may be present as racemates, as optically pure forms or in the form of the corresponding diastereomers. The anions of the following acids may for example be considered in particular: HBr, HCl, HI, HF, HNO₃, H₂ SO₄ (SO₄ ⁻⁻); (H₃ PO₄ (HPO₄ ⁻⁻); H₂ CO₃, (CO₃ ⁻⁻); HSCN, camphorsulfonic acid, aliphatic or aromatic sulfonic acids, for example C₁ -C₆ -alkylsulfonic acids (for example methanesulfonic acid, ethane-, propane- or hexanesulfonic acid), benzene- or naphthanlenesulfonic acid, which are optionally substituted once or twice by methyl groups (toluenesulfonic acid, in particular o- or p-toluenesulfonic acid), aliphatic C₁ -C₂₀ -monocarboxylic acids in particular C₁ -C₁₈ -monocarboxylic acids which are optionally substituted once, twice or three times by halogen atoms (in particular Cl, F) or also by a phenyl radical (in ω-position) (for example formic acid, acetic acid, propionic acid, palmitinic acid, stearic acid, chloroacetic acid, dichloroacetic acid, trifluoroacetic acid, trichloroacetic acid, ω-phenylstearic acid); aliphatic C₂ -C₁₁ -dicarboxylic acids which optionally contain a double bond (for example oxalic acid, malonic acid, 2-aminomalonic acid, malonic acid which is substituted in 2-position by a benzyl group or one or two C₁ -C₄ -alkyl groups, maleic acid, fumaric acid, succinic acid); aliphatic monohydroxy- and dihydroxy-monocarboxylic acids with 2 to 8, in particular 2 to 6 carbon atoms, these preferably being α-monohydroxycarboxylic acids such as lactic acid, glyceric acid, mandelic acid or glycolic acid; di- and tricarboxylic acids with 3 to 8 carbon atoms, in particular 3 to 6 carbon atoms (for example malic acid, tartaric acid, malonic acid) which may also be substituted at a carbon atom by a hydroxy group and/or optionally a C₁ -C₄ -alkyl group (isocitric acid, citric acid); phthalic acid which is optionally substituted by a carboxyl group (in particular in 4-position); gluconic acid; glucuronic acid; azetidinecarboxylic acid; squaric acid (3,4-dihydroxy-3-cyclobutene-1,2-dione); the natural α-amino acids (for example L-asparaginic acid); 1,1-cyclobutanedicarboxylic acid; organophosphoric acids such as aldose- and ketosephosphoric acids (for example the corresponding mono- and diphosphoric acids) for example aldose-6-phosphoric acids such as D- or L-glucose-6-phosphoric acid, α-D-glucose-1-phosphoric acid, D-fructose-6-phosphoric acid, D-galactose-6-phosphoric acid, D-ribose-5-phosphoric acid, D-fructose-1,6-diphosphoric acids; glycerinephosphoric acids (where the phosphoric acid radical is bound to one of the terminal or to the central glycerol oxygen atom) such as α-D,L-glycerophosphoric acid, β-glycerophosphoric acid; N-phosphonoacetyl-asparaginic acid; nitrilotris-methylphosphonic acid.

X preferably represents chlorine, bromine, iodine or --SCN (rhodanide) or the anion X is derived from a hydroxycarboxylic acid of the structure R₅ --CH(OH)--(CH₂)_(n) --CO₂ H, where n can have the values 0, 1, 3 or 4 and R₅ represents hydrogen, halogen, hydroxy, C₂ -C₆ -alkanoyloxy, C₁ -C₆ -alkoxy, C₁ -C₆ -alkyl or phenyl which is optionally substituted by halogen, hydroxy, C₁ -C₆ -alkoxy, C₁ -C₆ -alkyl or C₁ -C₆ -alkanoyloxy.

In the case of an oxycarboxylic acid of this type, the complex part ##STR7## has the following structure ##STR8##

Two groups X are absent in the case of platinum(II) complexes or are preferably in each case OH, Cl or Br.

X is preferably derived from lactic acid, mandelic acid or glycolic acid (in each case racemate, D-form, L-form).

Acids that may also be considered for the anions X are: aromatic carboxylic acids which contain one or several carboxy groups as well as in addition also one or several (for example, one, two, three, four or five) C₁ -C₄ -alkoxy groups and/or hydroxy groups (for example salicylic acid). Should there be several carboxy groups at the aromatic radical (for example benzene ring), at least 2 carboxy groups are preferably located in adjacent ring positions. Should the benzene ring contain for example 4 or 5 carboxy groups, complexes may be formed which contain per 1 Mol of the benzenecarboxylic acid anion 2 Mol of the platinum component. Two adjacent ring carboxy groups neutralize in each case 1 Mol of the platinum component, with the result that for example in the case of the benzenepentacarboxylic acid, the 1- and 2-position as well as the 4- and 5-position carboxy groups in each case neutralize 1 Mol of the platinum component (thus 2 Mol together), whereas the free 3-position carboxy group is free or in the salt form with a physiologically acceptable cation (for example alkali cation, in particular sodium cation). This applies quite generally if the anions X possess additional acid functions, which are not used for neutralization of the platinum. The situation is analogous in the case of the benzenehexacarboxylic acid, where 1 Mol of this acid may optionally neutralize 3 Mol of the platinum component. Examples of such acids are: benzenemonocarboxylic acid, benzenedicarboxylic acids, benzenetricarboxylic acids (for example trimellitic acid), benzenetetracarboxylic acids, benzenepentacarboxylic acid, benzenehexacarboxylic acid; syringic acid, orotic acid.

Acids which form the anions X, amino acids or amino acid derivatives, the basic amino group of which is protected by an acid group may also be considered. This may for example be amino acids of the following structure: ##STR9## where R¹ represents hydrogen, a phenyl radical, an indolyl-(3)methyl radical, imidazolyl-(4)-methyl radical, a C₁ -C₁₀ -alkyl group or a C_(1-C) ₁₀ -alkyl group which is substituted by a hydroxy group, an amino group, a carboxy group, a C₁ -C₆ -alkoxy group, a mercapto group, a C₁ -C₆ -alkylthio group, a phenyl group, a hydroxyphenyl group, a C₂ -C₆ -alkanoylamino group or a C₁ -C₆ -alkoxycarbonyl group.

The basic amino group in the 2-position is protected by a conventional amino acid protection group (acylated), for example by a C₂ -C₆ -alkanoyl radical, the benzoyl radical or the butyloxycarbonyl radical.

Should R¹ in the above formula be an alkyl group, this is preferably a C₁ -C₆ -alkyl group which contains for example in the 2-, 3-, 4-, 5- or 6-position (counting begins at the linkage point of the alkyl radical with the radical molecule) a C₂ -C₆ -alkanoylamino group, an imidazolyl-(4)-methyl radical or an indolyl-(3)-methyl radical. Individual examples of amino acids of this type are: leucine (preferably D- or L-form), valine (preferably D- or L-form), phenylalanine (preferably D- or L-form), phenylglycine (preferably D- or L-form), alanine (preferably D- or L-form), isoleucine (preferably D- or L-form), asparagine (preferably D- or L-form), lysine (preferably D- or L-form), tryptophan (preferably D- or L-form), tyrosine (preferably D- or L-form), ornithine (preferably D- or L-form), hydroxyproline (D- or L-form).

The basic amino groups in these acids may also be blocked by a conventional acylamino protective groups, such as the acetyl group, the chloroacetyl group, the benzoyl group or the butylcarbonyl group.

The corresponding acid addition salts may optionally also be prepared using physiologically acceptable acids, should the exchange groups X contain basic groups (for example amino groups).

Should X represent a water molecule, the stated acids may be considered, in particular strong acids, preferably H₂ SO₄ for neutralizing the positive charge of the platinum atom.

Formulae I and II also comprise the possible enantiomers and diastereomers. Should the compounds be racemates, these may be split into the optically active isomers in manner known per se, for example by means of an optically active acid or by means of chiral phases. It is, however, possible to use, for the synthesis of such isomers, enantiomerically pure or optionally also diastereoisomerically pure starting materials, where the end product obtained is then a correspondingly pure optically active or diastereomeric compound. Independent of the structure of the radicals X, the platinum ligand also possesses asymmetrical carbon atoms and may therefore be present in the racemate form or in optically active or diastereomeric forms.

In the case of the platinum atom, the compounds of the invention of Formula I are in particular the cis-compounds.

The starting amine II is for example used as the racemate, as pure laevo or dextro-rotating form, as cis- or trans-form (with regard to the position of the aminomethyl groups) or in another diastereomeric form.

These configurations are retained during the preparation of the platinum complex.

The process for the preparation of the platinum(II) complexes of the invention of Formula I is carried out in a solvent at temperatures between 10° and 80° C., preferably 20° to 40° C., in particular 25° to 30° C. Solvents that may for example be considered are: water, C₁ -C₆ -alkanols (methanol, ethanol, tert.-butanol), cyclic ethers such as tetrahydrofuran, dioxane, saturated ethers of mono or multivalent alcohols such as ethyleneglycol dimethyl ether, diethyleneglycoldimethyl ether, lower saturated ketones (acetone, methylethyl ketone), aprotic agents such as dimethyl sulfoxide or dialkylamides of lower aliphatic carboxylic acids (formic acid, acetic acid) with C₁ -C₆ -alkyl radicals such as dimethylformamide, dimethylacetamide as well as mixtures of these solvents, in particular mixtures with water.

The two reaction components (platinum compound and compound II) are preferably used in equimolar amounts. The pH value of the reaction solution should be between 5 and 9, preferably at pH 6. The adjustment of the pH value is in particular achieved by addition of alkali, preferably aqueous sodium hydroxide solution or potassium hydroxide solution or for example also using sodium carbonate or through addition of acids, preferably aqueous hydrochloric acid. The pH may also be adjusted using ion exchangers.

Tetrahalogen-platinum(II) compounds (acid as well as complex salts) that may be considered are the corresponding tetrachloro-, tetrabromo- and tetraiodo-compounds. Should platinum(II) halides be used as starting components, the same halogen atoms may be considered.

Monovalent cations that may be considered are: alkali ions, in particular sodium and potassium; lithium, rubidium, caesium may, however, also be used, as may NH₄ ⁺, NR₄ ⁺, PR₄ ⁺ or AsR₄ ⁺ in which R is a C₁ -C₆ -alkyl radical or a phenyl radical. Bivalent cations may be: alkaline earth ions, in particular Mg²⁺ and Ca²⁺, but also Zn²⁺. Platinum(II) halides may for example be PtCl₂, PtBr₂ and PtI₂.

The compound II is either used in the form of the diamine or in the form of an acid addition salt: for example as monohydrochloride or dihydrochloride, mono- or dihydrobromide, mono- or dihydroiodide or as a salt with another conventional inorganic or organic acid. In particular it is also possible to consider those acids whose anions form the radicals X. In addition, the diamine may be used in the form of the acetate or diacetate, mixing optionally being preceded by addition of potassium chloride (for example 2 Mol per 1 Mol compound II) to the reaction components. Similarly, the diamine II may for example be used in the form of the hydrochloride, carbonate, oxalate or malonate.

The preparation of ethylenediamine ligands of Formula II is carried out, for example, by reduction of a compound of the formula ##STR10## or of their salts, where Z is either the cyano group or the group --CONH₂ or represents the group ##STR11## and B and the radicals R₂, R₃ and R₄ have the meanings given above.

This process is carried out in a solvent or suspension agent at temperatures which are for example between 20° to 150° C., preferably 40° to 150° C. Working may optionally also be under increased pressure (up to 150 bar). Solvents or suspension agents that may for example be considered are: water, symmetrical or unsymmetrical alkyl ethers with alkyl groups of 1-6 carbon atoms, saturated cycloaliphatic ethers such as tetrahydrofuran, dioxan, C₁ -C₆ -alkanols (methanol, ethanol, isopropanol), lower alkylamides or dialkylamides of aliphatic C₁ -C₂ -carboxylic acids, cyclic aliphatic acid amides (5- or 6-ring) such as N-methylpyrrolidone as well as mixtures of these agents.

Reduction agents that may be considered are: catalytically activated hydrogen using conventional metal catalysts (with and without carriers), such as precious metal catalysts (palladium, palladium on carbon, palladium on barium sulphate, platinum, platinum oxide, rhodium, ruthenium) or also nickel and cobalt catalysts, for example mixtures of such catalysts. The non-precious metal catalysts may also be used metalically on carriers (for example on SiO₂, kieselguhr, Al₂ O₃) or in particular in activated form (for example of the Raney type). The amount of catalyst may for example also be used in excess, for example 1-80%, preferably 2-40%, in particular 10-30% of the starting compound used. Solvents that may be used here are preferably polar agents, such as alcohols or alcohol-water mixtures. Reduction is, however, also possible with light metal hydrides, in particular complex light metal hydrides (sodium hydride, lithium hydride, lithium aluminium hydride, sodium triethoxyaluminium hydride, sodium bis-2-methoxyethoxy - aluminium dihydride, lithium tri-tert.-butoxyaluminium hydride and the like) alicyclic or cyclic ethers preferably being used as solvent at temperatures of preferably 20-100° C.

Should the reduction be carried out with hydrogen as opposed to conventional hydrogenation catalysts, the process may also be carried out under pressure. Pressures of 1-300 bar, preferably 150 bar, in particular 70-100 bar may, for example, be considered.

Should the starting compounds of Formula III be nitriles or carboxylic acid amides (--CONH₂), reduction is preferably with a complex metal hydride (for example LiAlH₄) in a cyclic ether (tetrahydrofuran) at temperatures between 40-100° C. or using hydrogen in the presence of a platinum catalyst. Should an azide be reduced as starting compound III, this reduction is preferably also with a complex metal hydride such as LiAlH₄ at temperatures between 10° and 50° C. (solvents in particular aliphatic optionally aqueous ethers such as for example moist diethyl ether).

Should the reaction occur with complex metal hydrides, hydrolysis is subsequently needed. This occurs for example with water or aqueous cyclic or non-cyclic ethers (for example diethylethers) at temperatures between 0-30° C., preferably 0-20° C., in particular 0-5° C.

Diamine ligands of Formula II may also be prepared as follows: A ketone of general formula ##STR12## where B, for example is phenylalkyl radical (e.g. phenylethyl) is cyclized in known manner with hydrocyanic acid and ammonium carbonate to a hydantoin of the general formula ##STR13##

Temperature Ranges:

0-50° C., preferably 20° C. for the addition of the hydrocyanic acid

10-80° C., preferably 60° C. for the following reaction time

Ring Opening

The ring opening in the autoclave preferably occurs without pressure (intrinsic pressure develops, a few bar) at temperatures of 100-250° C., preferably 180° C.

Esterification

with SOCl₂ as described for the preparation of the starting substances.

Preparation of the Amide

in the glass autoclave (or other metal autoclave) alcoholic (methanolic at best) solution, which is saturated with ammonia.

Temperature

-20° C. to +50° C. (preferably room temperature)

Reduction of the Amide to Diamine

with LiAlH₄ (addition temperature for example -10° C.) in diethylether or tetrahydrofuran.

Precipitation of the Amine Preferably as Oxalate or Hydrochloride

Solvents that may be considered are alcohol/water mixtures or methanol/water.

Preparation of 5-methyl-5-phenethyl-hydantoin

=(5-methyl-5-phenethyl-imidazolin-2,4-dione)

A suspension of 144.1 g (1.5 Mol) ammonium carbonate in 800 ml methanol/water 1:1 mixture is prepared in a 2 liter three-necked flask. At a temperature of 20° C. 43.2 ml (1.1 Mol) hydrocyanic acid are added within 1 minute. 152.8 g (1.0 Mol) 4-phenyl-2-butanol (benzyl acetone) are then added dropwise, leading to a slight exothermic reaction (temperature increase to ca. 30° C.). The white emulsion is maintained at 40° C. for 1 hour and then for 2.5 hours at 60° C. The precipitate is suction filtered, washed twice with 50 ml methanol/H₂ O 1:1 and dried in a vacuum at 60° C.

Yield: 212.3 g 97.3% of theory

Melting point: 178-179 ° C.

α-Methyl-homo-phenylalanine

54.6 5-methyl-5-phenethyl-hydantoin (0.25 Mol) are reacted with 30 g sodium hydroxide (0.75 Mol) and 150 ml water for 3.5 hours in an autoclave at an oil bath temperature of 180° C. After cooling, 350 ml H₂ O are added and the clear, light brown solution adjusted with hydrochloric acid to pH 7.0. The white precipitate is suctioned off, washed with 20 mg H₂ O and dried in a vacuum drying cabinet at 65° C. The product is recrystallized twice from water.

Yield: 46.2 g 95.7% of theory.

α-Methyl-homo-phenylalanine-methyl ester

430 ml methanol are cooled to -10° C. in an ice/sodium chloride mixture and reacted with 21.3 ml thionyl chloride (exothermic reaction). 44.5 g (0.23 mol) α-methyl-homo-phenylalanine are added dropwise at room temperature. Boiling under reflux occurs for 8.5 hours, the mixture is concentrated in a rotary evaporator, taken up with H₂ O (350 ml) and reacted with 150 ml 25% NH₄ OH solution. Extraction with dichloromethane occurs 5× and the combined extracts are dried over calcium carbonate and concentrated in a rotary evaporator. Yellowish oil.

Yield: 32 g 67% of theory

α-Methyl-homo-phenylalanine amide

32 g α-methyl-homo-phenylalanine methyl ester (0.15 Mol) are reacted in a glass autoclave for 2 days with 2 liters saturated ammoniacal methanol solution at room temperature. The mixture is concentrated and the residue is washed wit 300 ml diethylether. White crystals

Yield: 18.6 g (62.6% of theory)

1-Phenethyl-1-methylethylenediamie oxalate

240 mol dry tetrahydrofuran are cooled to -10° C. in a ice/sodium chloride mixture. 10.96 g (0.289 Mol) lithiumaluminium hydride are carefully added. At -10° C. 18.5 g amide are carefully added, stirred in the cold for 30 minutes and then heated to boiling point. After 6.5 hours the mixture is cooled to -10° C. and 19 ml acetic acid ethyl ester and then 41 ml water are carefully added dropwise. The mixture is suction filtered, washed with tetrahydrofuran and evaporated.

The amine is taken up in 100 ml absolute alcohol and precipitated as oxalate by reaction with 8.64 g oxalic acid.

Yield: 13.4 g

The process for the preparation of platinum(IV) complexes of Formula I occurs for example in the same agents as for the process for preparing the platinum(II) complexes of Formula I. These reactions occur in a temperature range between 20° and 100° C., preferably 40-80° C. Oxidation agents that may be considered are: halogens such as chlorine gas, bromine, iodine, hydrogen peroxide (for example 3 to 60%; preferably 10 to 40%, in particular 35%), dirhodan (gaseous), hydrohalic acids (HCl, HBr, HI). Should the oxidation occur with halogen, dirhodan or hydrohalic acids, the additional presence of a compound HX may not be necessary.

In the case of the platinum(IV) complexes, 2 radicals X are in each case preferably either halogen or hydroxy. In the case of the platinum(II) complexes, these are square-planar complexes; in the case of the platinum(IV) complexes, of the 2 new additional substituents X the one radical X is above, the other radical X below the plane.

The exchange of the ligands X against other ligands may for example occur by means of silver halide precipitation. For example, a dihaloplatinum(II or IV) compound of Formula I, in which X represents halogen (chlorine, bromine or iodine) is reacted in a solvent or suspension agent at temperatures between 0° to 90° C., preferably 10° to 50° C., in particular 30° to 40° C., preferably 40° C. with the silver salts of another acid which corresponds to the meaning X. It is, however, also possible to use silver nitrate as silver salt (for example aqueous silver nitrate solution) and, for example when the platinum complex of Formula I is a platinum(II) complex, one obtains an ionic dihydro complex of formula ##STR14##

From this complex, the weakly bound ligand water can easily be displaced by anions with higher affinity (for example Cl⁻, Br⁻ the form of NaCl, KCl, NaBr, KBr, malonate²⁻, chloroacetate.sup.(-), oxalate²⁻, 1,1-cyclobutane dicarboxylic acid anion²⁻, glyconate, lactate and mandelate, as well as the remaining acid radicals X listed, used in the form of the acids or their salts, in particular their alkali salts.

The same compounds may also be obtained as follows: treatment of the previously mentioned dihydro nitrate complex with an anion exchanger in the hydroxide form (for example Dowex 1-8X), where the 2 molecules of water are replaced by OH and subsequent reaction of the complex compound so obtained (X=in each case OH) with the equimolar amount HX where X is a physiologically acceptable acid anion.

An exchange of the leaving group (for example SO₄ ²⁻ or oxalate anion²⁻) is also possible in the case of the sulfato- or oxalatoplatinum(II) compounds through reaction with alkaline earth salts which contain the desired X-ligands (for example glyceric acid), provided the complex formed is water soluble and thus permits the separation of the poorly water soluble alkaline earth sulfate or oxalate. X-ligands suitable for this process are preferably the anions of hydroxycarboxylic acids, sulfonic acids, haloacetic acids, nitric acid.

The solvents or suspension agents which are quoted for the method of preparation of compounds I may also be considered for the exchange reaction (the following are particularly suitable: water, dimethyl formamide, dimethyl acetamide, dimethyl sulfoxide, methanol, ethanol, tert.-butanol, acetone, methylethyl ketone). The exchange reaction is for example carried out in a pH range between 3 and 9.

Water solubility or solubility in physiologically acceptable agents or mixtures thereof among themselves and/or with water (aqueous NaCl, polyethylene glycols) of the platinum compounds of the invention may be improved through the use of solution promoting additives. These solubilizers are for example cyclodextrines, polyvinylpyrrolidone as well as non-ionic emulsifiers which are known under the trade mark Cremophor® (see H. P. Fiedler, Lexikon der Hilfsstoffe for Pharmazie, Kosmetik und angrenzende Gebiete dated 1971, Published by Cantor/Aulendorf in Wurttemberg, page 132-134).

This yields genuine solutions or optionally also suspensions or emulsions.

Cyclodextrins are cyclic oligosaccharides which are obtained by enzymatic degradation of starch. The main degradation products isolated are α, β- and γ-cyclodextrin, in which six (α), seven (β) or eight (γ) D-(α)-glucopyranose units are linked in their chair-form as α-1,4-glycosides and which have an interstice.

This interstice is available for the binding of non-polar substrates which become water soluble through inclusion in the hydrophilic sheath. The cavity has a diameter of 0.45 nm for α-cyclodextrin, 0.7 nm for β-cyclodextrin and 0.8-0.9 nm for γ-cyclodextrin.

In the case of the platinum complexes a part of the molecule has to penetrate the interstice in order to ensure solution promotion. For a preparation of this kind, the platinum complex of the invention is for example dissolved in ethanol and combined with the aqueous solution of the cyclodextrin. The solvent is then removed again. The remaining glassy residue is then water soluble after drying.

In the case of platinum complexes which are poorly soluble or even insoluble in ethanol or other organic solvents, the aqueous α-cyclodextrin solution is for example added to the suspension of the platinum complex and the mixture so obtained is heated in a water bath to 60° C. until a clear solution is formed.

The solubilities obtained are for example set out in the following table.

                  TABLE                                                            ______________________________________                                         The quoted amounts are totally soluble in 10 ml solvent mixture                consisting of 1.8% NaCl solution and polyethylene glycol 400                   (1:1).                                                                         The use of α-cyuclodextrin in double equivalent amount to the            platinum complex                                                               Compound According          with cyclodextrin                                  to example   without cyclodextrin                                                                          2:1                                                ______________________________________                                         2            6 mg           18 mg                                              ______________________________________                                    

This solvent mixture was selected because it is used for example in the application in the in vivo experiments.

Increase in the proportion of PEG in the solvent mixture improves dissolution behavior. For physiological reasons, however, this is not possible for the preparations to be applied.

The quantity ratio of cyclodextrin and platinum complex is preferably 2:1.

Polyvinylpyrrolidone

Polyvinylpyrrolidone (PVP) is a water-soluble polymer that is used in pharmaceutical technology inter alia as a viscosity increasing substance, as gel former and tabletting adjuvant. Polyvinylpyrrolidones having molecular weights of 5000 to 400000 may be considered.

Coprecipitates are formed together with the platinum complexes of the invention. To prepare these, the platinum complex is first dissolved, this being in ethanol or another organic solvent. The solution of the platinum complex is then mixed with the ethanolic PVP solution and the solvent drawn off.

The PVP chains prevent the development of interactions between the platinum complex molecules, with the result that a yellowish glass is formed in which the complex is distributed in the PVP matrix.

The platinum complex is present in unchanged form in the PVP matrix. The anion X (leaving group) is not exchanged during the coprecipitation.

The following table lists for example the amounts of platinum complex which may for example be dissolved as coprecipitate in 10 ml 1.8% sodium chloride solution/polyethylene glycol 400 (1:1).

Table

The quoted amounts are completely soluble in 10 ml solvent mixture composed of 1.8% NaCl solution and polyethylene glycol 400 (1:1).

    ______________________________________                                         Use of PVP in a ratio of 50:1 to the platinum complex                          Compound according                                                             to example      without PVP                                                                               as coprecipitate                                    ______________________________________                                         10              8.5 mg     18 mg                                               11              4.5 mg     18 mg                                               12              no solution                                                                               <5 mg                                                2               10 mg     <18 mg                                              ______________________________________                                    

The ratio of PVP to platinum complex is selected for the precipitate in such a way that there are 50 monomeric units of PVP to 1 platinum complex molecule. The PVP selected had an average molecular weight of 10,000.

The preparation of solutions, suspensions or emulsions of the platinum(II) complexes of the invention using the solubilizers occurs for example by heating the components to temperatures between 40° and 100° C., preferably 50-80° C., optionally with stirring or shaking or by means of ultrasound in water or a conventional organic solvent (in particular ethanol) or mixtures hereof. The solvent may then be removed by drawing off under vacuum or evaporation. This is for example necessary if the solvent/solvent mixture is not physiologically acceptable. The residue obtained is then taken up again optionally with stirring, shaking or with ultrasound into a physiologically acceptable solvent or suspension agent optionally with heating to 40-100° C., preferably 40-80° C.

The compounds of the invention possess tumor inhibiting properties and are suitable for the chemotherapy of tumour disorders. For example, in lymphatic leukemia P 388 in the female mouse, the compounds of the invention achieve a median survival time expressed in percent (% T/C, definition, see below) of over 125%, for example of 200-300%. Complexes of the compounds of the invention with haematoporphyrin show for example in P 388/leukemia a high anti-tumor effect at 1×10⁻⁵ to 4×10⁻⁵ Mol/kg body weight mouse.

The investigation for anti-tumour effect in P 388 leukemia in the mouse is carried out using the following method: lymphatic leukemia P 388 was established at the National Cancer Institute in the U.S.A. in 1955. The tumor line was induced through local application of methyl cholanthrene in DBA/2 mice and transferred in the first passage into the ascites form. Dawe, Potter, Am. Ass. Scientific Proceedings; Pathologists and Bacteriologists, 33 (1957), 603).

The strain is maintained in female DBA/2 mice. Since the mean survival time of this tumor is only about ten days, the tumor strain has to be transplanted weekly. For this purpose, the tumor-carrying animal is killed by breaking its neck and the milky-cloudy ascites removed under sterile conditions by means of abdominal puncture. The tumor cells are diluted with sterile-filtered, ice-cold PBS solution (phosphate buffered saline) to a cell count of 1×10⁶ /0.1 ml injection volume and implanted intraperitoneally into 6-10-week-old animals.

The substances are tested in female CD₂ F₁ mice (Zentralinstitut for Versuchstiere, Hannover) of body weight 17-21 g aged between 6-10 weeks. The tumor is removed on day 0 as described for strain maintenance and transplanted. Subsequently the animals are randomized in groups of six mice each.

On the following day (day 1) and on day 5 and day 9 (abbreviated d₁, d₅, d₉) the substances to be tested are administered in three different concentrations (1×10 Mol/kg; 2×10 Mol/kg and 4×10⁻⁵ Mol/kg to each group (i.e. per substance three groups applied according to body weight).

Per gram body weight of mouse, 0.01 ml of a solution are injected, containing in each case 1×10⁻⁵, 2×10⁻⁵ and 4×10⁻⁵ Mol platinum complex in 10 ml, i.e. the amount for 1 kg mouse.

The parameter for the antitumour effect of a substance is taken to be the so-called median survival time of the test group in comparison to the untreated controls: ##EQU1##

The following applies for mean survival time: ##EQU2## where x is the day on which the number of dead animals is N/2 and y is the earliest day on which the number of dead animals is (N/2)+1.

- with an uneven number of animals N: x

According to the NCI Protocol, a compound is considered to have anti-tumour activity if the T/C value is greater than 125%. Other information is obtained from the comparison of the animal weights on day 1 and day 5. The control animals gain 1.5-3 g in weight as a consequence of the growing ascites. Conversely, weight loss indicates toxic side effects. A substance is considered to be toxic in the given concentration if the weight loss is greater than 4 g or the T/C value is smaller than 85%.

The compounds of the invention show a good anti-tumor effect for example in P 388 leukaemia in the mouse (tumor implantation intraperitoneal, treatment 1×intraperitoneal). For example in the above experimental method, a dose of 21.5 mg/kg body weight mouse prolonged survival time by 57%.

The minimum effective dose in the above animal experiment is for example

2 mg/kg oral

0.5 mg/kg sublingual

0.5 mg/kg intravenous

The general dosage range for the effect (animal experiment as above) that may for example be considered is:

2-2000 mg/kg oral, in particular 50-500 mg/kg

0.5-1000 mg/kg intraperitoneal, in particular 3-100 mg/kg 0.5-1000 mg/kg intravenous, in particular 3-100 mg/kg

The direction of effect of the compounds of the invention is comparable with the effect of the known pharmaceutically active ingredient cisplatin, carboplatin, although there are in particular the following differences thereto: compared to cisplatin: virtually no neophrotoxicity compared to carboplatin: substantially lower myelotoxicity and haemotoxicity

Indications for which the compounds of the invention may be considered: chemotherapy of malignant diseases (cancer)

The pharmaceutical formulations contain in general between 1-2000, preferably 10-1000 mg of the active component(s) of the invention.

Administration may for example be in the form of tablets, capsules, pills, coated tablets, suppositories, ointments, gels, creams, powders, dusting powders, aerosols, lyophilisates, powders or in liquid form. Liquid forms of application that may for example be considered are: oily or alcoholic or aqueous solutions as well as suspensions and emulsions. Preferred forms of administration are tablets containing between 1 and 1000 mg, solutions containing 5 and 200 mg or lyophilisates containing between 5 and 400 mg, preferably 5 to 200 mg of the active substance.

The single dose of the active components of the invention lie a) in oral medicinal forms between 2 and 2000 mg, preferably 10-1000 mg.

b) in parenteral medicinal forms (for example intravenous, intramuscular) between 1 and 1000 mg, preferably 5-400 mg, in particular 5 to 200 mg.

c) in medicinal forms for rectal or vaginal application between 2 and 2000 mg, preferably 10-1000 mg.

d) in medicinal forms for local application to the skin and mucus membranes (for example in the form of solutions, lotions, emulsions, ointments and the like) between 0.01 and 10%, preferably 0.1 to 2%.

It is for example possible to recommend 3 times daily 1-4 tablets with a content of 10 to 500 mg active substance or for example in the case of intravenous injection 1 to 4 times daily one ampoule or injection bottle of 0.5 to 500 ml content with 1-200 mg substance. In the case of oral administration, the minimum daily dose is for example 1 mg; the maximum daily dose in oral administration should not exceed 2000 mg.

For the treatment of dogs and cats, the oral single dose generally lies between about 10 and 2000 mg/kg; the parenteral single dose about between 1 and 1000 mg/kg body weight.

The acute toxicity of the compounds of the invention in the mouse (expressed as the LD 50 mg/kg; method after Miller and Tainter: Proc. Soc. Exper. Biol. a. Med. 57 (1944) 261) lies for example with intraperitoneal application between 20 and 2000 mg/kg (depending on active substance).

The pharmaceuticals may be used in human medicine, in veterinary medicine and in agriculture alone or in mixture with other pharmacologically active substances.

-(The doses are in each case related to the free base)

Preparation of the Starting Materials for the Phenylalkylethylenediamine Ligands Starting Materials for C2-Substituted Phenylalkylethylenediamine

Working is based for example on an amino acid of the formula ##STR15## (for example phenylalanine or phenylalanine correspondingly substituted in the phenyl nucleus) and firstly esterifies these compounds in a manner known per se using thionyl chloride and methanol.

By means of the Grignard reaction the later substituents are introduced at the 2-position carbon atom of the benzylethylenediamine and the corresponding amino alcohols of formula ##STR16## are obtained. The amino alcohol obtained in this manner can now be transferred into the aziridine with Ph₃ PBr₂ and Et₃ N in acetonitrile by trans-elimination. For this purpose the reagent attaches itself onto the OH group of the alcohol and Ph₃ PO finally is eliminated with ring closure.

Ph₃ PBr₂ for the reaction is prepared in situ from Ph₃ P and Br₂. Opening of the aziridine ring occurs with NaN₃ with formation of the amino azide which can then be reduced with LiAlH₄ to the diamine ligand. This route may be considered in particular if the radicals R₃ and R₄ are alkyl radicals.

Should the radicals R₃ and R₄ be for example phenyl, p-anisyl or cyclohexyl, i.e. non-linear radicals, it is advisable to effect direct substitution of the OH group through the azide group with the three-component system azodicarboxylic acid diethyl ester, triphenylphosphine and alcohol with addition of a fourth component HX. A betaine structure is formed from the triphenyl phosphine and the azo compound which highly activates the OH group of the alcohol component for the displacement so that substitution with the azide nucleophile can occur from the hydrazoic acid. The hydrazoic acid needed is used in the form of a toluene solution, the content of which must be determined in each case.

The aminoazide is finally isolated by first carefully suctioning off the solvent and transferring the residue to a silica gel column. Chromatography with ether-toluene 1:1 separates the reaction product in sufficiently pure form. The starting aminoazides thereby obtained have the following general formula: ##STR17##

To obtain the diamine, reduction is carried out again with LiAlH₄. Examples of these reactions will be set out hereinbelow: D,L-phenylalanine methyl ester hydrochloride

Ca. 150 ml methanol are prepared and 115 mMol (13.68 g; 8.3 ml) SOCl₂ added slowly with ice cooling using a dropping funnel. The 110 mMol (18.17 g) D,L-phenylalanine are added in solid form. The batch is heated for 24 hours under reflux. After removal of the solvent a colorless residue is obtained that is dried under high vacuum (10⁻⁴ Torr). The ester hydrochloride is further processed without additional cleaning. Yield: quantitative.

By an analogous method one can obtain for example: 4-chlorophenylalanine methyl ester hydrochloride 4-methoxyphenylalanine methyl ester hydrochloride

Grignard Reaction 0.1 Mol D,L-2-methyl-3-amino-4-phenylbutan-2-ol (2.43 g)

Mg turnings are covered with ether. About 1/3 of the 2M solution of 0.1 Mol (14.2 g; 6.2 ml) CH₃ I in ether are then added from the dropping funnel. The Grignard reaction can be initiated by gentle heating. With gentle stirring the remaining methyliodide solution is added dropwise in such a way that the mixture is maintained just at the boiling point. After everything has been added, heating to boiling is continued for about a further 30 minutes.

After cooling, 0.017 Mol (3.6 g) D,L-phenylalanine methyl ester hydrochloride are added in portions as a solid substance. The mixture is then heated to boiling for 15 hours.

Hydrolysis is achieved with a saturated solution of 0.17 Mol (9.1 g) NH₄ Cl in water. The solution is carefully filtered with vigorous stirring in order to remove the insoluble hydrolysis product and the filtrate is transferred to a separating funnel.

The organic phase is dried over Na₂ SO₄ and then the solvent is suctioned off using a rotary evaporator. A colorless oil is obtained.

The aqueous phase is made ammoniacal with concentrated NH₃ and it is extracted with ether. After removal of the solvent an oily product is obtained. The oily residues from the organic and aqueous phase are distilled in a bulb tube in a high vacuum (10⁻⁴ Torr) at 120° C. Yield: 70% colourless oil.

In an analogous manner, the Grignard reaction can be carried out using other alkyl halides, cycloalkyl halides or aromatic halocompounds (for example bromobenzene, bromoanisol and the like).

The Aziridine Route (D,L-2-benzyl-3,3-dimethyl Aziridine

40 mMol (10.48 g) Ph₃ P are dissolved in 100 ml acetonitrile. 40 mMol (6.40 g; 2.06 ml) Br₂ in 40 ml acetonitrile are slowly added dropwise to this solution. 40 mMol (7.17 g) of the aminoalcohol, D,L-2-methyl-3-amino-4-phenylbutane-2-ol, are dissolved in ca. 100 ml acetonitrile and added dropwise to the Ph₃ PBr₂ solution. Addition occurs with ice cooling.

80 mMol (8.08 g; 11.1 ml) Et₃ N in 10 ml acetonitrile are slowly added dropwise to this mixture with stirring. After a short period a colorless precipitate of [Et₃ NH]⁺ [Br]⁻ appears.

After the mixture has been left to stand overnight, the triethylamine hydrobromide is filtered off and the filtrate is concentrated in a rotatary evaporator.

The residue is transferred to a liquid/liquid extractor and is extracted for 24 hours with 250 ml hexane. The precipitate of triethylamine hydrobromide which forms is filtered off and washed with hexane. The solvent is drawn off from the filtrate in a rotary evaporator and the residue is distilled in a bulb tube at 90° C. in a high vacuum (10⁻⁴ Torr). Yield: 40% colorless oil.

Opening of the Aziridine to the Amino Azides (D,L-1-phenyl-2-amino-3-azido-3-methyl butane)

10 mMol (1.61 g) of the aziridine are dissolved in 40 ml ethanol, mixed with 40 mMol (2.60 g) NaN₃ and 40 mMol (2.14 g) NH₄ Cl in 15 ml water and heated under reflux for 14-18 hours. The mixture is then diluted with water and shaken out with CH₂ Cl₂. The organic phase is dried over Na₂ SO₄ and the solvent is finally drawn off. Yield: 60% dark yellow oil.

The Azodicarboxylic Acid Diethyl Ester Route Preparation of the Hydrazoic Acid

0.1 Mol (6.5 g) NaN₃ are taken up in 6.5 ml distilled water. 40 ml toluene are added to this solution. Following cooling of the mixture to 0° C., 5.16 ml concentrated H₂ SO₄ (95%) is added dropwise in an ice bath in such a way that the temperature in the reaction vessel does not exceed +5° C.

After complete addition, the mixture is allowed to reach room temperature and is transferred to a separating funnel in order to separate off the aqueous phase. The toluene phase is dried over Na₂ SO₄. The HN₃ content of the toluene solution is determined titrimetrically with 0.1N NaOH.

D,L-1,1-dicyclohexyl-1-azido-2-amino-3-phenyl propane

22 mMol (3.89 g) azodicarboxylic acid diethyl ester dissolved in 20 ml toluene are added dropwise from the dropping funnel to a solution of 22 mMol (5.77 g) Ph₃ P and 20 mMol (6.4 g) D,L-1,1-dicyclohexyl-2-amino-3-phenylpropan-1-ol in 100 ml toluene. After addition of 22 mMol HN₃ in toluene solution, a colorless precipitate is formed. The mixture is stirred at room temperature for 15 hours, after which the precipitate is filtered off and the solvent suctioned off.

The brownish oil which is obtained as residue is again dissolved in a little toluene and applied to a silica gel column (50 cm×5 cm). After the substance has flowed into the column a chromatograph is taken with toluene/ether (1:1). The eluate is collected in four portions of ca. 70 ml each.

After the solvent has been drawn off, the IR spectra of fractions 3 and 4 show the azide bands of the amino-azide compound. Yield: 30% brownish-yellow oil.

The preparation of other 1-azido-2-amino-3-phenyl propanes with 2 substituents (for example 2 optionally substituted phenyl radicals) in 1 position is conducted in analogous manner.

Starting Materials for C1-substituted Phenylalkyl Ethylenediamines

Starting from the corresponding phenylalkyl ketones, the amino nitriles may be prepared and isolated in conventional manner therefor in a Strecker synthesis with NaCN and NH₄ Cl/NH₃. ##STR18##

After completion of the reaction, the product is isolated by adjusting the pH of the mixture to 6 using 1N HCl and the aminonitrile is then converted to its hydrochloride. The ketone which is still present can then be extracted with ether before the amine is released with ammonia, which can now also be extracted with ether.

After hydrolysis, the reduction of the amino nitrile with LiAlH₄ provides the corresponding diamines. This reduction also leads to a by-product in all cases. However, the desired diamine can be obtained in analytically pure form by means of simple bulb-tube distillation.

General Instructions for the Preparation of the Cis-diamine Dichloro-platinum(II) Complexes of Formula I A: Method in Water

5 mMol of the corresponding diamine (compound II) are dissolved in ca. 25 ml distilled water. The pH of the solution is adjusted to 6 using 1N HCl. 5 mMol K₂ PtCl₄ (2.08 g) are dissolved in 25 ml H₂ O and added to the neutral diamine solution with stirring. The batch is heated in a water bath to ca. 20° C. and the pH value is continuously monitored. If necessary, the mixture is adjusted to pH 6 with 1N NaOH. The reaction is regarded as complete, if the pH time remains virtually unchanged with time. The complex precipitates out as a fine crystalline precipitate and is filtered off (for example using a membrane filter frit). The mixture is then washed with water and a little ethanol and finally dried under a high vacuum (10⁻⁴ Torr). The reaction product can for example be recrystallized by dissolving 50 mg thereof in 10 ml hot acetonitrile, then cooling to room temperature and finally in a deep freeze to -10° C.

B: Method in Water/Tertiary Butanol

0.5 mMol of the corresponding diamine are diluted in 50 ml tertiary butanol by adding a solution of 0.5 mMol K₂ PtCl₄ in 5 ml water. A precipitate is formed which dissolves after addition of a further 25 ml of water. The solution so formed is neutralized with 1N HCl. After some time (for example after 30 minutes) the reaction product (platinum complex) separates off. After some hours (for example 3 hours) the precipitate is suctioned off and dried and optionally recrystallized, as set out under A.

EXAMPLE 1 D,L-1-(4-Chlorobenzyl)-2,2-dimethylethylenediaminedichloro-platinum(II) Method A

Yield: 76%, pale yellow powder; M.P.>300C (disintegration) C₁₁ H₁₇ Cl₃ N₂ Pt (molecular weight 478.7 g).

IR (KBr): 3240, 3110 cm⁻¹ (NH), 3040 (CH arom.), 2980 (CH aliph.), 1580 (NH), 330, 320 (PtCl).

1H-NMR ([D₇ ]DMF, 250 MHz): δ=7.34-7.44 (AA'BB', 4H, phenyl), 5.43 (m, 4H, NH₂), 3.13 (m, 1H, CH-N), 2.73-3.00 (m, masked by solvent signals, CH₂ -phenyl), 1.49 (s, 3H, CH₃), 1.40 (s, 3H, CH₃).

(The letters AA'BB', AB stand for coupling patterns for various proton groupings)

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               27.60         3.58   5.85                                           found:     27.58         3.50   5.76                                           ______________________________________                                    

EXAMPLE 2 D,L-1-Benzyl-2,2-dimethylethylenediaminedichloro-platinum(II) Method A

Yield: 37%, pale yellow needles: M.P.>300° C. (disintegration) C₁₁ H₁₈ Cl₂ N₂ Pt (molecular weight 444.3 g).

IR (KBr): 3190, 3110 cm⁻¹ (NH), 3020 (CH arom.), 2980 (CH aliph.), 1570 (NH), 300 (PtCl).

1H-NMR (CD₃ CN, 250 MHz): δ=7.21-7.29 (m, 5H, phenyl), 4.72, 4.44, 4.26, 4.07, 3.91 (5m, 4H, NH₂), 3.21 (m, 1H, ³ ICH-CH=3.8, ³ .sbsp.I CH-CH=11.0, ³.sbsp.I CH-NH=3.8, ³.sbsp.I CH-NH=18.0, CH-N), 2.88 (AB, 1H, ² I=14.3, CH-phenyl), 2.61 (AB, 1H, CH-phenyl), 1.40 (s, 3H, CH₃), 1.31 (s, 3H, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               29.74         4.08   6.31                                           found:     29.82         4.18   6.23                                           ______________________________________                                    

EXAMPLE 3 D,L-1-Benzyl-2,2-diethylethylenediaminedichloro-platinum(II) Method A

Yield: 68%, pale yellow powder; M.P.>300° C. (disintegration) C₁₃ H₂₂ Cl₂ N₂ Pt (molecular weight 472.3 g). IR (KBr): 3190, 3120 cm⁻¹ (NH), 3030 (CH arom.), 2970 (CH aliph.), 1590 (NH), 330, 320 (PtCl).

1H-NMR ([D₇ ]DMF, 250 MHz): δ=7.25-7.49 (m, 5H, phenyl), 5.37, 5.40 (2m, 1H, NH₂), 5.20, 5.25 (2m, 1H, NH₂), 5.06, 5.11 (2m, 1H, NH₂), 4.28, 4.32 (2m, 1H, NH₂), 2.93-3.12 (m, 3H, CH₂ phenyl, CH-N), 1.95-2.23, 1.72-1.91 (2m, 4H, CH₂), 0.97-1.08 (2t, 6H, ³ I=7.6, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               33.06         4.70   5.93                                           found:     33.22         4.67   5.93                                           ______________________________________                                    

EXAMPLE 4 D,L-1-Benzyl-2,2-dipentylethylenediaminedichloro-platinum(II) Method B

Yield: 37%, pale yellow powder; M.P.>300° C. (disintegration) C₁₉ H₃₄ Cl₂ N₂ Pt (molecular weight 556.5 g). IR (KBr): 3240, 3110 cm⁻¹ (NH), 3040 (CH arom.), 2960, 2940 (CH aliph.), 1580 (NH), 330, 320 (PtCl).

1H-NMR ([D₇ ]DMF, 250 MHz): δ=7.17-7.34 (m, 5H, phenyl), 5.54, 5.58 (2m, 1H, NH₂), 4.97, 3.69 (2m, 2H, NH₂), 3.48, 3.52 (2m, 1H, NH₂), 2.93-2.99 (m, 2H, ² I=11.1, ³ I=14.8, CH-phenyl, CH-N), 2.45 (AB, 1H, CH-phenyl), 1.25-1.69 (m, 16H, CH₂), 0.95 (t, 3H, CH₃), 0.88 (t, 3H, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               41.01         6.16   5.04                                           found:     41.43         5.93   4.66                                           ______________________________________                                    

EXAMPLE 5 D,L-1-Benzyl -2,2-dicyclohexylethylenediaminedichloro-platinum(II) Method B

Yield: 32%, pale yellow powder: M.P.>300° C. (disintegration) C₂₁ H₃₄ Cl₂ N₂ Pt (molecular weight 580.5 g). The complex can be precipitated out of the acetonitrile solution by adding ether at room temperature.

IR (KBr): 3200 cm⁻¹ (NH), 3040) (CH arom.), 2940, 2860 (CH-aliph.), 1610 (NH), 320 (PtCl).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               43.45         5.90   4.83                                           found:     43.15         4.60   5.13                                           ______________________________________                                    

EXAMPLE 6 D,L-1-Benzyl-2,2-diphenylethylenediaminedichloro-platinum(II)

5 mMol (1.51 g) D,L-1-benzyl-2,2-diphenylethylenediamine are mixed with enough 1N HCl to dissolve the semi-solid diamine. This solution is neutralized with 1N NaOH, whereupon a cloudy emulsion appears.

5 mMol (2.08 g) K₂ PtCl₄, dissolved in 25 ml H₂ O, are added to this emulsion. At a constantly maintained pH value of 6.5-7 stirring continues for ca. 5 hours until the precipitated complex can be filtered off.

The precipitate is washed with ether and distilled H₂ O and dried in a high vacuum (10⁻⁴ Torr).

Yield: 56%, pale yellow powder; M.P.>300C C₂₁ H₂₂ Cl₂ N₂ Pt (molecular weight 568.4 g).

IR (KBr): 3220, 3160 cm⁻¹ (NH) 3110 (CH arom.), 2960, (CH aliph.), 1580 (NH), 330, 320 (PtCl).

1H-NMR ([D₇ ]DMF, 250 MHz): δ=7.95-8.13 (m, 5H, phenyl), 7.33-7.56 (m, 10H, phenyl), 6.62 (m, 2H, NH₂), 4.94, 5.00 (2m, 1H, NH₂), 4.32-4.38 (2m, 1H, NH₂), 3.92 (m, 1H, ³ I, ³ I=14.8, CH-N), 3.26 (AB, 1H, ² I=11.1, CH-phenyl), 3.11 (AB, 1H, CH-phenyl).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               44.36         3.90   4.93                                           found:     44.13         4.11   4.83                                           ______________________________________                                    

EXAMPLE 7 D,L-1-Benzyl-2,2-di(4-methoxyphenyl)ethylenediaminedichloro-platinum(II) Method B (reaction time ca. 5 hours)

Yield: 56%, pale yellow powder; M.P.>300° C. (disintegration) C₂₃ H₂₆ Cl₂ N₂ O₂ Pt (molecular weight 628.5 g).

IR (KBr): 3260, 3160 cm⁻¹ (NH), 3090 (CH arom.), 2960, 2940 (CH aliph.), 1610 1580 (NH), 330, (PtCl).

1H-NMR (CDCl₃ 250 MHz): δ=6.87-8.13 (AA'BB', 4H, phenyl), 7.23-7.32 (m, 5H, phenyl), 6.89-7.17 (AA'BB', 4H, phenyl), 6.11, 6.19 (2m, 1H, NH₂), 4.83, 4.79 (2m, 2H, NH₂), 3.97, 3.87 (2m, 1H, NH₂), 3.89, 3.80 (2s, 6H, OCH₃), 3.26 (AB, 1H, CH-phenyl), 2.46 (m, 1H, CH-N), 2.22 (AB, 1H, CH-phenyl).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               43.95         4.17   4.46                                           found:     44.49         4.54   4.19                                           ______________________________________                                    

EXAMPLE 8 D,L-1(4-Methoxybenzyl)-2,2-di(4-methoxyphenyl)ethylenediaminedichloro-platinum(II) Method B

(Precipitation of the reaction product as in Example 5)

Yield: 32%, pale yellow powder; M.P.>300° C. (disintegration) C₂₄ H₂₈ Cl₂ N₂ O₃ Pt (molecular weight 658.5 g).

IR (KBr): 3240, 3180 cm⁻¹ (NH) 3100 (CH arom.), 2960, 2940 (CH aliph.), 1610, 1580 (NH), 330 (PtCl).

1H-NMR (CDCl₃, 250 MHz): δ=6.86-8.32 (AA'BB', 4H, phenyl), 7.01-7.29 (AA'BB', 4H, phenyl), 6.80-7.07 (AA'BB', 4H, phenyl), 6.14, 6.22 (2m, 1H, NH₂), 4.82, 4.79 (2m, 2H, NH₂), 3.95, 4.02 (2m, 1H, NH₂), 3.89, 3.80, 3.20 (3s, 9H, OCH₃), 3.20 (AB, 1H, CH-phenyl), 2.46 (m, 1H, CH-N), 2.12 (AB, 1H, CH-phenyl).

EXAMPLE 9 D,L-1-Benzyl-1-phenylethylenediaminedichloro-platinum(II) Method B

Yield: 62%, pale yellow powder; M.P.>300° C. (disintegration) C₁₅ H₁₈ Cl₂ N₂ Pt (molecular weight 492.3 g).

IR (KBr): 3280, 3200 cm⁻¹ (NH) 3060 (CH arom.), 2960, 2920 (CH aliph.), 1610, 1580 (NH), 330, (PtCl).

¹ H-NMR ([D₇ ]DMF, 250 MHz): δ=7.59-7.64, 7.38-7.48, 7.08-7.34, 6.92-6.96 (4m, 10H, phenyl), 5.52-5.57 (m, 4H, NH₂), 3.65 (AB, 1H, ² I=13.4, CH-phenyl), 3.53 (AB, 1H, CH-phenyl), 3.13-3.30 (m, 2H, CH₂).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               36.59         4.23   6.53                                           found:     36.53         3.71   5.36                                           ______________________________________                                    

EXAMPLE 10 D,L-1-Benzyl-1-methylethylenediaminedichloro-platinum(II) Method A

Yield: 73%, pale yellow powder; M.P.>300° C. (disintegration) C₁₀ H₁₆ Cl₂ N₂ Pt (molecular weight 430.3 g).

IR (KBr): 3300, 3200 cm⁻¹ (NH), 3140 (CH arom.), 2960, 2940 (CH aliph.), 1610, 1580 (NH), 320, (PtCl).

1H-NMR ([D₇ ]DMF, 250 MHz): δ=7.26-7.42, (m, 5H, phenyl), 5.37, 6.07 (m, 2H, NH₂), 5.37, 5.41 (2m, 1H, NH₂), 5.02, 5.06 (2m, 1H, NH₂), 3.21 (s, 2H, CH₂ -phenyl), 2.86-2.95, 2.53-2.58 (2m, 2H, masked by solvent signals, CH₂ -N), 1.39 (s, 3H, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               27.92         3.75   6.51                                           found:     28.11         3.66   6.42                                           ______________________________________                                    

EXAMPLE 11 D,L-1-Benzyl-1-ethylethylenediaminedichloro-platinum(II) Method A

Yield: 54%, pale yellow powder; M.P.>300° C. (disintegration) C₁₁ H₁₈ Cl₂ N₂ Pt (molecular weight 444.3 g).

IR (KBr): 3200, 3280 cm⁻¹ (NH), 3140 (CH arom.), 2960, 2940 (CH aliph.), 1610, 1580 (NH), 320, (PtCl).

1H-NMR ([D₇ ]DMF, 250 MHz): δ=7.46-7.56, 7.33-7.37 (2m, 5H, phenyl), 5.54, (m, 2H, NH₂), 5.08, 5.11 (2m, 1H, NH₂), 4.72, 4.77 (2m, 1H, NH₂), 3.33 (AB, 1H, ² I=13.8 CH-phenyl), 3.10 (AB, 1H, CH-phenyl), 2.72-2.76 (masked by solvent signals, 2H, CH₂ -N), 1.67-1.86 (m, 2H, CH₂), 1.06, 1.12 (t, 3H, ³ I=7.6, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               29.74         4.08   6.31                                           found:     29.91         4.13   6.28                                           ______________________________________                                    

EXAMPLE 12 1,1-Dibenzyl-1-ethylethylenediaminedichloro-platinum(II) Method A: (Diamine Soluble in Water After Gentle Heating)

Yield: 63%, pale yellow powder; M.P.>300° C. (disintegration) C₁₆ H₂₀ Cl₂ N₂ Pt (molecular weight 506.4 g).

IR (KBr): 3260, 3200 cm⁻¹ (NH), 3120 (CH arom.), 2960 (CH-aliph.), 1610, 1580 (NH), 330, (PtCl).

1H-NMR ([D₇ ]DMF, 250 MHz): δ=7.44-7.59, 7.31-7.43 (2m, 10H, phenyl), 5.60 (m, 2H, NH₂), 4.63 (m, 2H, NH₂), 3.37 (AB, 2H, ² I=13.7, CH₂ -phenyl), 3.10 (AB, 2H, ² I=13.7, CH₂ -phenyl), 2.67 (m, 2H, CH₂ -N).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               37.95         3.98   5.53                                           found:     38.32         4.27   5.47                                           ______________________________________                                    

EXAMPLE 13 2-Amino-2-aminomethylindane dichloro-platinum(II) Method A

Yield: 80%, pale yellow power; M.P.>300° C. (disintegration) C₁₀ H₁₄ Cl₂ N₂ Pt (molecular weight 428.2 g).

    __________________________________________________________________________     IR (KBr):                                                                           ν(NH)          ν(C═C)                                                                       CH                                                      sym.              sym. arom.                                                   and CH   CH       and  out of                                             [cm.sup.-1 ]                                                                        asym.                                                                              arom.                                                                               aliph.                                                                             δ(NH)                                                                         asym.                                                                               plane                                                                              νPtCl                                       __________________________________________________________________________     13   3240s                                                                              3050m                                                                               2920w                                                                              1590m                                                                               1490m                                                                               750s                                                                               310m                                                3180m    2840                                                                               1580m                                                                               1460m                                                                               800m                                               __________________________________________________________________________     1H-NMR ([D.sub.7 ]DMF, 250 MHz):                                                       d[ppm]        Assignment                                               __________________________________________________________________________             7.25-7.15 (m, phenyl),                                                         5.74 (m,      NH.sub.2),                                                       3.38 (s,      CH.sub.2 -indan),                                                2.92 (m,      CH.sub.2),                                               __________________________________________________________________________     Analysis: C           H  N                                                     __________________________________________________________________________     calculated:                                                                              28.05       3.30                                                                              6.54                                                  found:    28.10       3.34                                                                              6.27                                                  __________________________________________________________________________

EXAMPLE 14 D,L-3-Aminomethyl-1,2,3,4-tetrahydroisoquinoline dichloro-platinum(II) Method A

Yield: 65%, pale yellow powder; M.P.>300° C. (disintegration) C₁₀ H₁₄ Cl₂ N₂ Pt (molecular weight 428.2 g).

    ______________________________________                                         IR (KBr):                                                                            (NH)                        (C═C)                                                                            CH                                           sym.                        sym.  arom.                                        and     CH      CH          and   out of                                 [cm.sup.-1 ]                                                                         asym.   arom.   aliph.                                                                               (NH)  asym. plane PtCl                             ______________________________________                                         14    3260m   3120s   2960w 1590m 1500m 760s  310m                                   3200m           2860w 1580m 1460m 710w  330m                             ______________________________________                                         IH-NMR ([D.sub.7 ]DMF, 250 MHz):                                               [ppm]          Assignment                                                      ______________________________________                                         7.11-7.22 (m,  phenyl),                                                        6.33 (m,       NH.sub.2, NH),                                                  5.57 (m,       NH.sub.2, NH),                                                  4.68 (AB-syst. CH.sub.2, tetrahydroisoquinoline),                              4.54 (AB-syst. CH.sub.2, tetrahydroisoquinoline),                              4.03-4.14 (m,  CH-tetrahydroisoquinoline-N                                     3.02-3.24 (m,  CH--N/CH.sub.2 -tetrahydroiso-                                                 quinoline-N)                                                    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               28.05         3.30   6.54                                           found:     28.94         3.39   6.33                                           ______________________________________                                    

EXAMPLE 15 D,L-1-Amino-1-aminomethyltetralin dichloro-platinum(II) Method A

Yield: 77%, yellow powder C₁₁ H₁₆ Cl₂ N₂ Pt (molecular weight 442.3 g).

IR (KBr): 3280, 3220 cm⁻¹ (NH), 3060 (CH arom.), 2970, 2920 (CH aliph.), 1590 (NH), 320, (PtCl).

1H-NMR (DMF-d₇, 250 MHz): 730-7.14, (m, 4H, phenyl), 5.54 (m, 4H, NH₂), 3.75-3.68 (m, 2H, CH₂ -phenyl), 2.71 (m, CH₂ -N. masked by solvent signals), 2.29-1.28 (m, 4H, CH₂).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               29.87         3.65   6.34                                           found:     30.22         3.64   6.29                                           ______________________________________                                    

EXAMPLE 16 D,L-1-Amino-4-aminomethylchroman dichloro-platinum(II) Method A

Yield: 52%, yellow powder C₁₀ H₁₄ Cl₂ N₂ OPt (molecular weight 444.2 g).

IR (KBr): 3240, 3200 cm⁻¹ (NH), 3070 (CH arom.), 2960 (CH aliph.), 1590 (NH), 320 (PtCl).

1H-NMR (DMF-d₇, 250 MHz): 7.28-6.81 (m, 4H, phenyl), 5.79, 5.64 (2m, 4H, NH₂), 4.48-4.20 (m, 2H, CH₂ -O), 3.37-3.25 (m, 2H, CH₂ -N), 2.78-2.73 (m, 2H, CH₂, masked by solvent signals).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               24.04         3.18   6.31                                           found:     27.39         3.20   6.09                                           ______________________________________                                    

EXAMPLE 17 D,L-2-Amino-2-aminomethyldecalin dichloro-platinum(II) Method A

Yield: 62%, yellow powder C₁₁ H₂₂ Cl₂ N₂ Pt (molecular weight 448.3 g). IR (KBr): 3200, 3140 cm⁻¹ (NH), 2920, 2860 (CH aliph.), 1580 (NH), 320 (PtCl). 1H-NMR (DMF-d₇, 250 MHz): 5.40-5.02 (3m, 4H, NH₂), 2.78, 2.73 (m, CH₂ -N, 2H masked by solvent signals), 2.22-0.89 (m, 16H, CH, CH₂).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               29.47         4.95   6.25                                           found:     30.28         5.07   6.18                                           ______________________________________                                    

EXAMPLE 18 D,L-1-(p-Methoxy)benzyl-1-methylethylenediaminedichloro-platinum(II) Method A

Yield: 68%, yellow needles, recrystallized from acetonitrile C₁₁ H₁₈ Cl₂ N₂ OPt (molecular weight 460.3 g). IR (KBr): 3260, 3210 cm⁻¹ (NH), 3050 (CH arom.), 2960, 2930 (CH aliph.), 1610, 1570 (NH), 320 (PtCl).

1H-NMR (DMF-d₇, 250 MHz): 7.32-6.39 (AA'BB', 4H, phenyl), 5.58-4.95 (4m, 4H, NH₂), 3.80 (s, 3H, CH₃ -O), 3.15 (AB, 2H, CH₂ -phenyl), 2.90-2.81 (m, CH₂ -N, masked by solvent signals), 1.37 (s, 3H, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               28.70         3.94   6.09                                           found:     28.78         4.00   6.05                                           ______________________________________                                    

EXAMPLE 19 D,L-2-Amino-2-aminomethyltetralin dichloro-platinum(II) Method A

Yield: 39%, yellow needles C₁₁ H₁₆ Cl₂ N₂ Pt (molecular weight 442.3 g).

IR (KBr): 3240, 3195 cm⁻¹ (NH), 3060 (CH arom.), 2950, 2910 (CH aliph.), 1580 (NH), 330 (PtCl).

1H-NMR (DMF-d₇, 250 MHz): 7.14 (m, 4H, phenyl), 5.54-5.47 (m, 4H, NH₂), 3.26 (AB, 2H, CH₂ -phenyl), 3.07, 3.00 (m, 2H, CH₂ -phenyl, masked by solvent signals), 2.45-2.40 (m, 2H, CH₂ -N), 2.40-2.19 (m, 2H, CH₂).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               29.87         3.65   6.34                                           found:     30.42         4.05   6.24                                           ______________________________________                                    

EXAMPLE 20 1-(p-Hydroxy)benzyl-1-methylethylenediaminedichloro-platinum(II) Method A

Yield: 57%, yellow needles C₁₀ H₁₆ Cl₂ N₂ OPt (molecular weight 446.2 g).

IR (KBr): 3350 cm⁻¹ (OH), 3270, 3250 (NH), 3020 (CH arom.), 2960, 2920 (CH aliph.), 1585, 1620 (NH), 360 (PtCl).

1H-NMR (DMF-d₇, 250 MHz): 9.51 (s, 1H, OH), 7.22-6.80 (AA'BB', 4H, phenyl), 5.55-4.89 (m, 4H, NH₂), 3.09 (AB, 2H, CH₂ -phenyl), 2.87-2.54 (m, 2H, CH₂ -N, masked by solvent signals), 1.37 (s, 3H, CH₃).

EXAMPLE 21 Dichloro(1-phenethyl-1-methylethylenediamine)-platinum(II) ##STR19##

5 g (0.02 Mol) 1-phenethyl-1-methylethylenediamine oxalate are dissolved in 50 ml water with 4.5 KOH. A solution of 8.26 g (0.02 Mol) potassium tetrachloroplatinate in 50 ml H₂ O is added thereto dropwise with stirring and stirring continued for 2 hours at 50° C.

The precipitate is suction filtered, washed with water and dried in a vacuum at 40° C. Yellow powder, M.P. 298° C. (decomposition)

Yield: 6.21 g

The glycolato complex (replacement of the 2 Cl by glycolic acid) is for example obtained as follows:

12.5 g chlorine complex are suspended with 9.56 g silver nitrate in 80 ml water and 8 ml ethanol. Stirring continues for several days at 45° C. with exclusion of light, the precipitate is suction filtered and the filtrate is mixed with 2.13 g (0.028 Mol) glycolic acid. After stirring for several days at room temperature the mixture is concentrated in a rotary evaporator, the residue is washed with diethyl ether and dried in a vacuum. White powder, M.P. 219-221° C. (decomposition). The compound contains 2 Mol water.

Yield: 9.5 g

The D-lactato complex is obtained by analogy with the glycolate complex by using instead of the glycolic acid 12.6 g (0.028 Mol) D-lactic acid 20%. The workup is the same.

M.P. 206-207° C. (decomposition). The compound contains 1 Mol water.

Yield: 9.8 g

The preparation of the L-lactato complex is carried out by analogy with the D-lactato complex with 12.6 g (0.028 Mol) L-lactic acid 20%. White powder, M.P. 203-204° C. (decomposition)

Yield: 10.5 g

The preparation of the stearinato complex is carried out in a manner analogous to the lactato complex with 14.34 g (0.056 Mol) stearic acid. Yellow powder, M.P. 228C (decomposition: substance D 21 393).

Yield: 8.3 g

The preparation of the neodecanato complex is carried out in an analogous manner to the D-lactato complex with 0.056 Mol (9.6 g) neodecanic acid. Yellow, pasty product (substance D 21 392).

Yield: 9.4 g; no melting point

The ω-phenyloctadecanato(ω-phenyl-stearinato) complex is prepared by analogy with the D-lactato complex with 20.1 g (0.056 Mol) ω-phenyloctadecanic acid (ω-phenyl-stearic acid). Yellowish, slightly pasty solid (substance D 21 394).

Yield: 24 g; no melting point

The sulphato complex is prepared by reaction of 2 g (0.0045 Mol) chloro complex with 1.25 g (0.004 Mol) silver sulphate in 800 ml water/100 ml ethanol mixture. The reaction time is 4 days at 45-50° C. After suction filtering over a membrane filter, 2.1 g of a white product are obtained. (substance D 21 407).

M.P.: 243° C. (decomposition).

In a manner analogous to the preparation of the D-lactato complex, 10 g chloro complex (0.0225 Mol) are reacted with 5.9 g 0.045 Mol N-acetyl-L-alanine.

Yield: 5.8 g white powder (substance D 21 476).

M.P.: 225° C. (decomposition).

The complex still contains 1 Mol water.

The nitrolotris(methylphosphonato) complex is prepared in a manner analogous to the D-lactato complex by reaction with 0.056 Mol (16.7 g) nitrolotris-methylphosphonic acid. White powder M.P.: 254° C. (substance D 21 569).

Yield: 7.8 g The complex has the following structure: ##STR20##

EXAMPLE 22 ##STR21## Dichloro-dihydroxy-(1-phenethyl-1-methylethylenediamine)-platinum(IV)

1 g Dichloro(1-phenethyl-1-methylethylenediamine)-platinum(II) (0.002 Mol) is suspended in 30 ml water. 10 ml 35% hydrogen peroxide solution are added dropwise at 70° C. The highly foaming suspension is stirred for 4 hours at 70° C. and a clear solution is obtained.

The excess H₂ O₂ is carefully destroyed with 600 mg platinum activated charcoal (with stirring). After filtration through a membrane filter the mixture is evaporated and the residue is washed with diethylether. Pale-yellow powder (substance D 20 975), M.P. 208-209° C. (decomposition).

Yield: 600 mg

Dihydroxy-distearinato(1-phenethyl-1-methylethylenediamine)-platinum(IV)

The corresponding distearinato complex (replacement of the two Cl by 2 stearic acid anions) is obtained as follows):

1 g stearinato-platinum(II) complex (substance D 21 393) is suspended in 30 ml H₂ O and 10 ml 35% H₂ O₂ solution carefully added dropwise at 70° C. (vigorous foaming). The mixture is treated with 600 mg platinum active charcoal after 5 hours' stirring at 70° C., filtered over a membrane filter, evaporated and the residue is washed with ether. Yellow powder (substance D 21 406), M.P. 200-202° C. (decomposition).

Yield: 400 mg

Dihydroxy-dineodecanato (1-phenethyl-1-methylethylenediamine-platinum(IV)

1 g (0.001 Mol) neodecanato-platinum(II) complex (substance D 21 392) is oxidized in a manner analogous to the dihydroxydistearinato compound (see above) with 10 mg 35% H₂ O₂ solution. Yellow product that hardens to a sticky mass. Yield: 1.0 g (substance D 21 423). No melting point.

EXAMPLE 23 Further Examples for the Exchange of Group X Preparation of Lactate Complexes

The lactic acid used for this exchange reaction must be freshly distilled since polymeric esters could form during storage over a longer period of time.

The platinum complex with the anion X (for example X=Cl) is first converted to the appropriate diamine-dihydro-platinum(II) complex for example in the following manner:

5 mMol of platinum complex (for example chloro complex) are suspended in ca. 25 ml H₂ O. This is done by alternately placing the batch into an ultrasonic bath for one hour and stirring for one hour, complex forming on the wall of the flask always being rinsed back into the suspension. An adequate suspension is achieved after this procedure has been repeated three to four times. A solution of 10 mMol (1.86 g) AgNO₃ in ca. 5 ml H₂ O is then added with exclusion of light. After the batch has been stirred for one week, the precipitated AgCl is filtered off as a pale-grey precipitate over a membrane filter frit. The dihydro complex remains in solution.

D,L-1-Benzyl-2,2-dimethylethylenediamine-L-lactato-platinum(II)

5 mMol (0.45 g) L-(+)-lactic acid are dissolved in 10 ml distilled water in order to serve as reservoir for the ion exchange column.

25 g strongly basic ion exchanger (Merck; Ion exchanger III; exchange capacity 4 mVal/g; that is 25 g=100 mVal, i.e. 10-fold excess compared to the platinum complex) are filled into a chromatographic column. The ratio of column diameter to column length should be 1:4 to 1:10.

In order to coat the ion exchange resin with OH⁻, it is first flushed eight times with the resin volume of 2N NaOH. The pH of the eluate is then adjusted to a pH of ca. 9 by subsequent washing with H₂ O.

Finally, the filtrate of the D,L-1-benzyl-2,2-dimethylethylenediamine-dihydro complex is brought to the column prepared in this manner and added dropwise to the stirred reservoir at a throughflow speed of ca. 2 cm/minute.

After addition has been completed, the mixture is stirred for a further 3-4 hours at 40° C.

To isolate the complexes the water first has to be totally removed. The glassy residue is then taken up with ca. 5 ml ethanol and the solution is reacted with 100 ml ether. A colorless, flocculant precipitate is obtained. While the precipitate is filtered off under nitrogen blanket, the filter cake should be suctioned dry as quickly as possible since it rapidly acquires a brown discoloration and begins to liquify when wet.

Yield: 67% (in relation to the chloro complex) colorless powder C₁₄ H₂₂ N₂ O₃ Pt (molecular weight 461.4 g).

IR (KBr): 3200, 3080 cm⁻¹ (NH), 3060 (CH arom.), 2980 (CH aliph.), 1680, 1610 (C═O), 380 (PtO).

1H-NMR (D₂ O, 250 MHz): δ=7.25-7.34 (m, 5H, phenyl), 4.35, 4.02, 3.57 (3m, 1H, CH), 2.83-2.93 (m, 1H, CH-N), 2.46-2,72 (m, 2H, CH₂ -phenyl), 1.09-1.46 (m, 9H, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               36.50         4.80   6.07                                           found:     36.34         5.04   5.84                                           ______________________________________                                    

The following lactato complexes are obtained in an analogous manner.

D,L-1-Benzyl-1-methylethylenediamine-L-lactato-platinum(II)

Yield: 32% (in relation to the chloro complex) colourless powder C₁₃ H₂₀ N₂ O₃ Pt (molecular weight 447.4 g).

IR (KBr): 3200, 3100 cm⁻¹ (NH),3040 (CH arom.), 2980, 2940 (CH aliph.), 1750, 1610 (C=O), 370 cm⁻¹ (PtO). 1H-NMR (D₂ O, 250 MHz): δ=7.23-7.32 (m, 5H, phenyl), 3.98-4.02 (m, 1H, CH), 2.83-3.55, 2.38-2.62 (2m, 4H, CH₂ -phenyl), CH₂ -N), 1.14-1.35 (m, 6H, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               34.90         4.51   6.26                                           found:     34.79         5.04   6.01                                           ______________________________________                                    

D,L-1-Benzyl-1-ethylethylenediamine-L-lactato-platinum(II)

Yield: 54% (in relation to the chloro complex) colorless powder C₁₄ H₂₂ N₂ O₃ Pt (molecular weight 461.4 g).

IR (KBr): 3200, 3080 cm⁻¹ (NH), 3040 (CH arom.), 2980, 2940 (CH aliph.), 1730, 1610 (C=O), 760, 700 (PtO).

1H-NMR (D₂ O, 250 MHz): δ=7.21 (m, 5H, phenyl), 4.34, 4.10, 3.99, 3.56 (4m, 1H, CH), 2.88-2.99, 2.41-2.55 (2m, 4H, CH₂ -phenyl, CH₂ -N), 1.46-1.76 (m, 2H, CH₂), 1.34, 1.22, 1.17, 1.10 (4d, 3H, ³ I=6.9, CH), 0.91-0.96 (m, 3H, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               36.44         4.81   6.07                                           found:     35.73         4.99   5.55                                           ______________________________________                                    

1,1-Dibenzylethylenediamine-L-lactato-platinum(II)

Yield: 32% (in relation to the chloro complex) colorless powder C₁₉ H₂₄ N₂ O₃ Pt (molecular weight 523.5 g). IR (KBr): 3200, 3080 cm⁻¹ (NH), 3040 (CH arom.), 2980 (CH aliph.), 1730, 1610 (C=O), 370 (PtO).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               40.78         5.04   5.00                                           found:     40.60         4.92   5.00                                           ______________________________________                                    

D,L-1-Benzyl-1-ethylethylenediamine glycolato-platinum(II)

Yield: 58% colorless powder C₁₃ H₂₀ N₂ O₃ Pt (molecular weight 447.4 g).

IR (KBr): 3220, 3110 cm⁻¹ (NH), 3040 (CH arom.), 2980, 2950 (CH aliph.), 1640 (CO), 370 (PtO).

1H-NMR (D₂ O, 250 MHz): 7.31 (m, 5H, phenyl), 3.94 (AB, 2H, CH₂ O), 3.04-2.83, (m, 2H, CH₂ -phenyl), 2.49, 2.47 (m, 2H, CH₂ -N, 1.85-1.51 (m, 2H, CH₂), 1.08-0.96 (2t, 3H, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               34.90         4.51   6.26                                           found:     34.44         4.82   5.35                                           ______________________________________                                    

D,L-1-Benzyl-1-ethylethylenediamine mandelato-platinum(II)

Yield: 47% colorless powder C₁₉ H₂₄ N₂ O₃ Pt (molecular weight 523.5 g).

IR (KBr): 3220, 3110 cm⁻¹ (NH), 3060, 3040 (CH arom.), 2980, 2940 (CH aliph.), 1640 (CO), 360 (PtO).

1H-NMR (CD₂ 0D, 250 MHz): 7.72, 7.31 (2m, 10H, phenyl), 4.86, 4.88 (2s, 1H, CH-phenyl), 3.11, 2.96 (m, 2H, CH₂ -phenyl), 2.51-2.43 (m, 2H, CH₂ -N), 1.89-1.55 (m, 2H, CH₂), 1.07, 1.06 (2t, 3H, CH₃).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               43.59         4.63   5.35                                           found:     43.56         4.88   5.49                                           ______________________________________                                    

2-Amino-2-aminomethylindan-L-lactato-platinum(II)

Yield: 36% (in relation to the chloro complex) colorless powder C₁₃ H₁₈ N₂ O₃ Pt: (molecular weight 445.4 g). IR (KBr): 3280, 3220 cm⁻¹ (NH), 3060 (CH aromatic), 2970, 2920 (CH aliphatic, 1590(NH), 320 (PtCl).

    ______________________________________                                         Analysis:  C             H      N                                              ______________________________________                                         calculated:                                                                               32.40         4.61   5.81                                           found:     31.95         4.43   5.44                                           ______________________________________                                    

The exchange of the group X using other anionic groups or acids is for example carried out in a manner analogous to that described above.

EXAMPLE 24 Examples for the Cyclodextrin-Platinum Complex Preparations Preparation of D,L-1-benzyl-2,2-dimethylethylenediamine dichloro-platinum(II) with α-cyclodextrin

1×10⁻⁵ Mol (4.4 mg) of the previously mentioned platinum complex are dissolved in ca. 50 ml ethanol with gentle heating (30° C.). The double-equivalent amount of α-cyclodextrin, i.e. 2×10⁻⁵ Mol (19 mg) are dissolved in ca. 10 ml distilled water. Both solutions are combined and the solvent is removed in a rotary evaporator.

The glassy residue is dried in a high vacuum (10⁻⁴ Torr) and for example for the test on P 388 mouse leukaemia dissolved in 10 ml solvent mixture of polyethylene glycol 400 and 1.8% sodium chloride solution (1:1) in an ultrasonic bath.

EXAMPLE 25 Example of the Preparation of Polyvinylpyrrolidone Coprecipitates

1×10⁻⁵ Mol D,L-1-benzyl-1-methylethylenediamine dichloro platinum(II) are dissolved in ca. 50 ml ethanol with heating (30° C.). 56 mg polyvinylpyrrolidone-10 (average molecular weight 10,000) are dissolved in 10 ml ethanol and added to the platinum complex solution. After removal of the solvent a yellow glassy residue is obtained that is dried in a high vacuum. To prepare the application solution this coprecipitate is for example dissolved in an ultrasonic bath in 10 ml of the solvent mixture polyethylene glycol 400/1.8% sodium chloride solution (1:1).

Preparation of C2-substituted Benzylethylenediamine Ligands of Formula ##STR22## as well as of cyclic amine ligands as well as of C1-substituted benzylethylenediamine ligands which are substituted at the benzyl radical. EXAMPLE 26 D,L-1-Benzyl-2,2-dimethylethylenediamine

9 mMol (1.8 g) Amino-azide D,L-1-phenyl-2-amino-3-azido-3-methyl butane are dissolved in ca. 30 ml ether and added dropwise with ice cooling to a suspension of 20 mMol (0.76 g) LiAlH₄ in 30 ml ether. After boiling under reflux for 4-5 hours, the mixture is allowed to cool and is hydrolyzed at 0-5° C. with moist ether and a little water. The sludge-like hydrolysis product is suction filtered and the filtrate dried over Na₂ SO₄.

After removal of the solvent, the residue is bulb-tube distilled in a high vacuum (10⁻⁴ Torr) at ca. 90° C.

The residue from the hydrolysis is extracted overnight in a Soxhlet apparatus with 100 ml CH₂ Cl₂. The extract is freed of solvent after drying and the residue is also distilled in a high vacuum at 90° C.

Yield: 50% colorless oil

IR: see Table 1

EXAMPLE 27 D,L-1-(4-chlorobenzyl)-2,2-dimethylethylenediamine

Method: analogous Example 26, using 9 mMol to (1.8 g) D,L-1-(4-chlorophenyl)-2-amino-3-azido-3-methyl butane. Bulb-tube distillation in a high vacuum (10⁻⁴ Torr) at 120° C.

Yield: 54% colorless oil

IR: see Table 1

EXAMPLE 28 D,L-1-Benzyl-2,2-diethylethylenediamine

Method: analogous to Example 26, using 9 mMol (2.1 g) D,L-1-phenyl-2-amino-3-azido-3-ethyl-n-pentane. Bulb-tube distillation in a high vacuum (10⁻⁴ Torr) at 90©C.

Yield: 90% colorless oil

IR: see Table 1

EXAMPLE 29 D,L-1-Benzyl-2,2-di-n-pentylethylenediamine

Method: analogous to Example 26, using 9 mMol (2.8 g) D,L-1-phenyl-2-amino-3-azido-3-n-pentyl-n-octane. Bulb-tube distillation in a high vacuum (10⁻⁴ Torr) at 140° C.

Yield: 90% colorless oil

IR: see Table 1

EXAMPLE 30 D,L-1-Benzyl-2,2-dicyclohexylethylenediamine

Method: analogous to Example 26, using 9 mMol (2.8 g) D,L-1, -dicyclohexyl-1-azido-2-amino-3-phenyl propane.

IR: see Table 1

Preparation of the dihydrochloride:

1.5 g diamine are dissolved in 10 ml ether and the solution is cooled down to -70° C. After brief introduction of HCl gas a yellowish precipitate is obtained which is filtered off, washed with ether and dried. The dihydrochloride is a pale yellow, hygroscopic powder.

EXAMPLE 31 D,L-1-Benzyl-2,2-diphenylethylenediamine

Method: analogous to Example 26, using 9 mMol (3.0 g) D,L-1,1-diphenyl-1-azido-2-amino-3-phenyl propane. Bulb-tube distillation in a high vacuum (10⁻⁴ Torr) at 130° C.

Yield: 67% brown semisolid oil

IR: see Table 1

EXAMPLE 32 D,L-1-Benzyl-2,2-di(4-methoxyphenyl)ethylenediamine

Method: analogous to Example 26, using 9 mMol (83.2 g) D,L-1,1-di(4-methoxyphenyl)-1-azido-2-amino-3-phenyl propane. Bulb-tube distillation in a high vacuum (10⁻⁴ Torr) at 200 ° C.

Yield: 30% semisolid oil

IR: see Table 1

EXAMPLE 33 D,L-1-(4-methoxybenzyl)-2,2-di(4-methoxyphenyl)ethylenediamine

Method: analogous to Example 26, using 9 mMol (3.8 g) D,L-1,1-di(4-methoxyphenyl)-1-azido-2-amino-3-(4-methoxyphenyl)propane. Cleaning by means of chromatography over a silica gel column (50 cm×5 cm). The substance is applied in toluene/ether (1:1). Using this elution agent a 1st zone is separated out and this is discarded. The diamine is finally washed off the column using methanol.

Yield: 20% yellow, semisolid oil

IR: see Table 1

EXAMPLE 34 D,L-1-Amino-1-aminomethyltetralin

69.7 mMol (2.6 g) LiAlH₄ are suspended in 70 ml tetrahydrofuran. 34.8 mMol (6.0 g) D,L-1-amino-1-cyanotetralin in 30 ml tetrahydrofuran are added dropwise to this suspension with ice cooling.

After removal of the ice bath the mixture is refluxed overnight. Hydrolysis occurs by adding 20 ml water dropwise with ice cooling. The slurry-like hydrolysis product is filtered off and extracted overnight with 250 ml tetrahydrofuran in a Soxhlet apparatus. The filtrate and the extraction solution are combined and the solvent is drawn off. A brown oil is obtained which is bulb-tube distilled in a high vacuum (10⁻⁴ Torr). The by-product is distilled over at 60° C. The diamine is obtained at a temperature of 90° C.

Yield: 18%, colorless oil C₁₁ H₁₆ N₂ (molecular weight 176.3 g)

IR: see Table 1

EXAMPLE 35 D,L-4-Amino-4-aminomethylchroman

Method: by analogy with Example 26 using 20.1 mMol (3.5 g) D,L-4-amino-4-cyanochroman.

Bulb-tube distillation (10⁻⁴ Torr):

1st fraction at 70° C. (by-product)

2nd fraction at 100° C. (diamine)

Yield: 27%, yellow oil

C₁₀ H₁₄ N₂₀ (molecular weight 178.2 g)

IR: see Table 1

EXAMPLE 36 D,L-2-Amino-2-aminomethyldecalin

Method: by analogy with Example 26 using 62.8 mMol (11.2 g) D,L-2-amino-2-cyanodecalin.

Bulb-tube distillation (10⁻⁴ Torr)

1st fraction at 60° C. (by-product)

2nd fraction at 100° C. (diamine)

Yield: 10%, colourless oil

C₁₁ H₂₂ N₂ (molecular weight 182.3 g)

IR: see Table 1

EXAMPLE 37 D,L-1-(p-Methoxy)benzyl-1-methylethylenediamine

Method: by analogy with Example 26 using 33.6 mMol (6.4 g) D,L-1-(p-methoxy)phenyl-2-amino-2-cyanopropan.

Bulb-tube distillation (10⁻⁴ Torr):

1st fraction at 65° C. (by-product)

2nd fraction at 90° C. (diamine)

Yield: 15%, colorless oil C₁₁ H₁₈ N₂ O (molecular weight 194.3 g)

IR: see Table 1

EXAMPLE 38 2-Amino-2-aminomethyltetralin

Method: by analogy with Example 26 using 31.0 mMol (5.9 g) tetralin-2-amino-2-carboxylic acid amide.

Bulb-tube distillation

Boiling point: 110° C. (10⁻⁴ Torr):

Yield: 45%, colorless oil C₁₁ H₁₁ N₂ (molecular weight 176.3 g)

IR: see Table 1

EXAMPLE 39 1-(p-Hydroxy)benzyl-1-methylethylenediamine

7.21 mMol (1.4 g) 1-(p-Methoxy)benzyl-1-methylethylenediamine are dissolved in 150 ml methylene chloride and cooled to -78° C. 43.21 mMol (4.1 ml) BBr₃ are then added dropwise at the same temperature and stirred for one hour at -78° C. and then for 20 hours at 20° C. The mixture is hydrolyzed at 0° C. with 30 ml methanol, during which part of the product crystallizes out. After distillation of the solvent the product is obtained quantitatively as a colorless solid.

Yield: quantitative, colorless solid C₁₀ H₁₆ N₂ O (molecular weight 180.2 g)

IR: see Table 1

                  TABLE 1                                                          ______________________________________                                         IR data of the C2-substituted benzyl-                                          ethylenediamines (film) [cm.sup.-1 ]                                                  ν(NH)                     ν(C═C)                                                                         δCH                                  sym.                         sym.   arom.                               Example                                                                               and     VCH            δ(NH)                                                                          and    out of                              No.    asym.   arom.   VCH    aliph.                                                                               asym.  plane                               ______________________________________                                         26     3390m   3020m   2980s  1600s 1500s  700s                                       3300m                        1450s  750s                                27     3360m   3040w   2980s  1600s 1500s  840m                                       3280m           2960m        1450m  810s                                28     3380m   3040s   2980s  1610s 1500s  700s                                       3320m           2960s        1460s  750s                                29     3400m   3040s   2980s  1610s 1500s  710s                                       3320m           2960s        1460s  750s                                30     3340m   3040m   2940s  1660m 1500m  700s                                                       2860s        1460s  730m                                31     3380m   3040s   2920s  1610s 1500s  700s                                       3300m   3060s   2860m        1450s  750s                                32     3400m   3020s   2960s  1620s 1510s  700s                                       3340m   3040s   2920s  1620s 1450s  750                                 33     3360b   3020m   2960s  1620s 1510s  830s                                               3040m   2920m  1580m 1470m                                      34     3370sb  3060m   2930s  1600s 1480s  740s                                       3300sb  3020m   2860s        1440s                                      35     3380sb  3080m   2950s  1620s 1500s  770s                                       3300sb  3040m   2880s  1580s 1460s                                      36     3280sb          2900s  1600s                                                                   2860s                                                   37     3360sb  3040w   2910s  1615s 1510s  840s                                       3280sb  3000w   2820s  1590s 1565s                                      38     3100.sup.-                                                                             3020w   2920s  1600s 1500s  740s                                       3400sb          2850m        1460s                                      39     3360sb  3030w   2920w  1620s 1525s  835s                                IR in  3310sb  3010w   2850w  1585s                                            KBr    3530 (OH) sb                                                            ______________________________________                                    

Preparation of C1-substituted Benzylethylenediamine Ligands of the Formula ##STR23## EXAMPLE 40 D,L-1-Benzyl-1-phenylethylenediamine

Method: by analogy with Example 26 using 9 mMol (2.3 g) D,L-1,2-diphenyl-2-azido-3-aminopropan. Bulb-tube distillation in a high vacuum (10⁻⁴ Torr) at 180° C.

Yield: 83% colorless oil

IR: see Table 2

EXAMPLE 41 D,L-1-Benzyl-1-methylethylenediamine

0.4 Mol (15.2 g) LiAlH₄ are prepared as a suspension in ca.100 ml tetrahydrofuran. 0.1 Mol (16.02 g) D,L-1-Phenyl-2-amino-2-cyanopropan are dissolved in 150 ml tetrahydrofuran and added dropwise using a dropping funnel to the LiAlH₄ suspension with ice cooling. After addition has been completed, the ice bath is removed and the mixture is boiled under reflux for 15 hours.

For purposes of hydrolysis 1.6 Mol (28.8 ml) distilled water are carefully added dropwise with ice cooling and with vigorous stirring.

The slurry-like hydrolysis product is filtered off and extracted in a Soxhlet apparatus for 15 hours with 250 ml tetrahydrofuran.

The residue which is obtained after distillation of the solvent is bulb-tube distilled in a high vacuum (10⁻⁴ Torr). The fraction of the by-product can be totally distilled off at temperature of 70° C.

The diamine is finally distilled over at 100° C.

Yield: 42% colorless oil

IR: see Table 2

EXAMPLE 42 D,L-1-Benzyl-1-ethylethylenediamine

Method: by analogy with Example 41 using 0.1 Mol (17.4 g) D,L-1-phenyl-2-amino-2-cyanobutane. Bulb-tube distillation in a high vacuum (10⁻⁴ Torr)

1st fraction at 60° C. (by-product)

2nd fraction at 95° C. (diamine)

Yield: 28%, colorless oil

IR: see Table 2

EXAMPLE 43 1,1-Dibenzylethylenediamine

Method: by analogy with Example 41 using 0.1 Mol (23.6 g) 1,3-diphenyl-2-amino-2-cyanopropan. Bulb-tube distillation in a high vacuum (10⁻⁴ Torr):

1st fraction at 100° C. (by-product)

2nd fraction at 150° C. (diamine)

Yield: 32%, slightly yellowish oil

IR: see Table 2

                  TABLE 2                                                          ______________________________________                                         IR data of the Cl-substituted benzyl-                                          ethylenediamines (film) [cm.sup.-1 ]                                                  ν(NH)                     ν(C═C)                                                                         CH                                         sym.                         sym.   arom.                               Example                                                                               and     CH      CH           and    out of                              No.    asym.   arom.   aliph. δ(NH)                                                                          asym.  plane                               ______________________________________                                         40     3390m   3040    2920m  1610s 1500 s 710s                                       3300m           2860m  1590w 1460s  760s                                41     3290m   3020s   2920s  1610s 1500s  710s                                       3300m           2860s  1590m 1460s  760m                                42     3390m   3020s   2920s  1610s 1500 s 710s                                       3300            2860s  1590m 1460s  760m                                43     3390m   3040s   2920s  1610s 1500s  710s                                       3300m           2860s  1590m 1460s  760m                                ______________________________________                                    

PREPARATION OF CYCLIC BENZYLETHYLENEDIAMINES Example 44 2-Amino-2-aminomethylindane

Method: by analogy with Example 41 using 0.1 Mol (15.8 g) 2-amino-2-cyanoindane.

Bulb-tube distillation in a high vacuum (10⁻⁴ Torr) at 150° C.

Yield: 46%, colorless solid

IR (KBr): [cm⁻¹ ] see following table:

    ______________________________________                                         ν(NH)                        ν(C═C)                                                                          CH                                     sym.                            sym.    arom.                                  and    CH       CH              and     out of                                 asym.  arom.    aliph.   δ(NH)                                                                           asym.   plane                                  ______________________________________                                         3320m  3080m    2900s    1610m  1490s   750s                                   3240m  3020m    2840m    1580m  1440s   710w                                   ______________________________________                                    

EXAMPLES OF GALENIC FORMULATIONS Examples of Capsules

1 kg of the compound of Example 21 in the form of the L-lactic acid complex, 625 g microcrystalline cellulose and 11 g highly disperse silicon dioxide are passed through a sieve of mesh size 0.8 mm and homogenized. 39 g magnesium stearate (sieved 0.8 mm) are then added to this mixture and mixing continued for a further one minute.

To prepare the capsules, the capsule mass is dispensed in known manner in a capsule machine equipped with size 00 molds into hard gelatin capsules of size 00. The filled amount per capsule is 670 mg, corresponding to 400 mg active substance.

Example for a Lyophilizate with Skeleton Former

20 g of the compound of Example 21 and 94 g mannitol are dissolved with stirring in 900 ml sterile water suitable for injection purposes. The mixture is then made up to 1 liter with sterile water suitable for injection purposes.

This solution is sterile filtered through a membrane filter of 0.2 μm pore width under aseptic conditions and dispensed in 2 ml portions into 10 ml injection vials of hydrolytic class I. The vials are closed with a freeze-drying stopper and lyophilized in an appropriate installation. After drying, the vials are sealed in the installation with gassing with sterile, dry nitrogen. The stoppers are secured with a cap.

For intravenous use the lyophilizate is dissolved in 4 ml water for injection purposes.

Each injection vial contains 40 mg active substance, 1 ml of solution contains 10 mg active substance.

Example for a Lyophilizate Without Skeleton Former

20 g of the compound of Example 21 are dissolved with stirring in 3900 ml sterile water suitable for injection purposes. The mixture is then made up to 4 liters with sterile water suitable for injection purposes.

This solution is sterile filtered through a membrane filter of 0.22 μm pore width under aseptic conditions and dispensed in 8 ml portions into 30 ml injection vials of hydrolytic class I. The vials are closed with a freeze-drying stopper and lyophilized in an appropriate apparatus. After drying, the vials are sealed in the apparatus with gassing with sterile, dried nitrogen. The stoppers are secured with a cap. For intravenous use the lyophilizate is dissolved in 8 ml water for injection purposes.

Each injection vial contains 40 mg active substance, 1 ml of solution contains 5 mg active substance.

Example of a Phospholipid Dispersion

20 g of the compound of Example 21, in which two stearic acid anions are present in place of the two Cl⁻, are dissolved in 4 kg CH₂ Cl₂ with stirring. 399.8 g soya lecithin and 0.2 g α-tocopherol are then added with stirring. The organic solvent is removed in a vacuum (for example using a rotary evaporator). The lipid film is reacted with 9.58 kg 0.9% NaCl solution, shaken for 3 hours and filtered consecutively under aseptic conditions through 0.8 and 0.2 μm membrane filters. The liquid is filled under aseptic conditions in 2 g portions into hydrolytic class I injection vials. The vials are sealed with injection stoppers.

Each injection vial contains 40 mg active substance in 2 g phospholipid dispersion. 

What is claimed is:
 1. Pharmaceutical compositions containing a platinum (II or IV) complexes of the general formula ##STR24## where B represents a phenyl-C₁ -C₄ -alkyl radical which is optionally substituted in the phenyl nucleus by the radical R₁ and R₁ is hydrogen, halogen, trihalogen methyl, C₁ -C₆ -alkyl, hydroxy, C₁ -C₆ alkoxy or C₂ -C₆ -alkanoyloxy or where B together with the structural part H₂ N-CR₂ < forms a tetrahydroisoquinoline radical, if B contains benzyl and R₂ hydrogen and the benzyl radical in the 2-position contains the CH₂ -radical or where B together with the structural part --CR₂ < represents a tetrahydronaphthyl radical in which one CH₂ is optionally replaced by oxygen, or where B together with the structural part --CR₂ < represents a decahydronaphthyl radical or an indanyl radical; R₂ represents hydrogen, C₁ -C₆ -alkyl, phenyl or phenyl-C₁ -C₄ -alkyl, it also being possible for the phenyl ring of this group R₂ to be substituted by hydroxy, C₁ -C₄ -alkoxy, C₁ -C₄ -alkyl, C₂ -C₆ -alkanoyloxy or halogen;the radicals R₃ and R₄ are the same or different and represent hydrogen, C₁ -C₁₂ -alkyl, C₃ -C8-cycloalkyl, phenyl which is optionally substituted by C₁ -C₆ -alkoxy and, if B is a benzyl radical (optionally substituted as stated), at least one of the radicals R₂, R₃ and R₄ is not hydrogen and X stands for the equivalent of a physiologically acceptable anion or X can also be a water molecule, where in the latter case the missing negative charge is saturated by a corresponding physiologically acceptable acid anion, where in the case of platinum (II) complexes, two of the groups X are absent, and a member of the group consisting of pharmaceutically acceptable carriers, diluents and auxiliary substance.
 2. A pharmaceutical composition as set forth in claim 1 which is a solution and which contains a stabilizer.
 3. A pharmaceutical composition as set forth in claim 1 which is a solution and which contains a solubilizer.
 4. A pharmaceutical composition as set forth in claim 3 in which the solubilizer is a cyclodextrin or polyvinylpyrrolidone.
 5. A method of treating cancer which comprises administering a pharmaceutically effective amount of a platinum (II or IV) complexes of the general formula ##STR25## where B represents a phenyl-C₁ -C₄ -alkyl radical which is optionally substituted in the phenyl nucleus by the radical R₁ and R₁ is hydrogen, halogen, trihalogen methyl, C₁ -C₆ -alkyl, hydroxy, C₁ -C₆ alkoxy or C₂ -C₆ -alkanoyloxy or where B together with the structural part H₂ N--CR₂ < forms a tetrahydroisoquinoline radical, if B contains benzyl and R₂ hydrogen and the benzyl radical in the 2-position contains the CH₂ -radical or where B together with the structural part --CR₂ < represents a tetrahydronaphthyl radical in which one CH₂ is optionally replaced by oxygen, or where B together with the structural part --CR₂ < represents a decahydronaphthyl radical or an indanyl radical; R₂ represents hydrogen, C₁ -C₆ -alkyl, phenyl or phenyl-C₁ -C₄ -alkyl, it also being possible for the phenyl ring of this group R₂ to be substituted by hydroxy, C₁ -C₄ -alkoxy, C₁ -C₄ -alkyl, C₂ -C₆ -alkanoyloxy or halogen;the radicals R₃ and R₄ are the same or different and represent hydrogen, C₁ -C₁₂ -alkyl, C₃ -C8-cycloalkyl, phenyl which is optionally substituted by C₁ -C₆ -alkoxy and, if B is a benzyl radical (optionally substituted as stated), at least one of the radicals R₂, R₃ and R₄ is not hydrogen and X stands for the equivalent of a physiologically acceptable anion or X can also be a water molecule, where in the latter case the missing negative charge is saturated by a corresponding physiologically acceptable acid anion, where in the case of platinum (II) complexes, two of the groups X are absent. 